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Imperialism Rise in Nationalism • During the French and Industrial Revolution, nationalism continued to inspire nations to increase their political and economic power. • Nationalism became the ideal force in the political, economic, and cultural life in the world, becoming the first universal ideology-organizing all people into a nation state. Nationalism Defined • The strong belief that the interest of a particular nation-state is of primary importance. o Nation-State – a state where the vast majority shares the same culture and is conscious of it. It is an ideal in which cultural boundaries match up with political ones. • As an ideology, it is based on the idea that the individual’s loyalty and devotion to the nation-state surpass other individual/group interests. • Exalting one nation’s belief above all others and placing primary emphasis on promotion of its culture and interests, excluding the interests of others. Changing the World through a Nationalistic Vision • The French Revolution significantly changed the political world and how countries govern. • The Industrial Revolution significantly changed the economic world. • The Age of Imperialism (1870-1914) dramatically changed the political, economic, and social world. What is Imperialism? • Imperialism- The policy of extending the rule of authority of an empire or nation over foreign countries, or of acquiring and holding colonies and dependencies. Power and influence are done through diplomacy or military force. Reasons for Imperialism • There are 5 main motives for empires to seek to expand their rule over other countries or territories: 1. Exploratory • Imperial nations wanted to explore territory unknown to them. • The main purpose for this exploration of new lands was for resource acquisition, medical or scientific research. o Charles Darwin • Other reasons: o Cartography (map making) o Adventure 2. Ethnocentric • Europeans acted on the concept of ethnocentrism o Ethnocentrism- the belief that one race or nation is superior to others. • Ethnocentrism developed out of Charles Darwin’s “survival of the fittest” theory. Philosophers used the theory to explain why there were superior races and inferior races. o This became known as Social Darwinism. • Most imperial nations believed that their cultural values or beliefs were superior to other nations or groups. • Believed imperial conquest would bring successful culture to inferior people. 3. Religious • Imperial expansion promoted a religious movement of people setting out to convert new members of conquered territories. • With the belief that Christianity was superior, missionaries believed it was their duty to spread Christianity to the world. • Christian missionaries established churches, and in doing so, they spread Western culture values as well. • Typically, missionaries spread the imperial nation's language through education and religious interactions. 4. Political • Patriotism and Nationalism helped spur our imperial growth, thus creating competition against other supremacies. • It was a matter of national pride, respect, and security. • Furthermore, European rivalry spurred nations for imperial conquest. Since land equaled power, the more land a country could acquire the more prestige they could wield across the globe. • Empires wanted strategic territory to ensure access for their navies and armies around the world. • The empire believed they must expand, thus they needed to be defended. 5. Economic • With the Industrial Revolution taking place during the same time, governments and private companies contributed to find ways to maximize profits. • Imperialized countries provided European factories and markets with natural resources (old and new) to manufacture products. • Trading posts were strategically placed around imperialized countries to maximize and increase profits. o Such places as the Suez Canal in Egypt which was controlled by the British provided strategic choke hold over many European powers. o Imperial powers competed over the best potential locations for resources, markets, and trade. History of Imperialism • Ancient Imperialism 600 BCE-500 CE o Roman Empire, Ancient China, Greek Empire, Persian Empire, Babylonian Empire. • Middle Age Imperialism (Age of Colonialism-1400-1800s) o Great Britain, Spain, Portugal, France, Netherlands (Dutch), Russia. • Age of Imperialism 1870-1914 o Great Britain, Spain, Portugal, France, Germany, Belgium, Italy, Japan, United States, Ottoman Empire, Russia. • Current Imperialism...? o U.S. Military intervention (i.e. Middle East) o Russia’s Invasion of Ukraine. Imperialism Colonialism • Refers to political or economic control, either legally or illegally. • Refers to where one nation assumes control over the other. • Creating an empire, expanding into neighboring regions and expanding the dominance far outside its borders. • Where a country conquers and rules over other regions for exploiting resources from the conquered country for the conqueror's benefit. • Foreign government controls/governs a territory without significant settlement. • Foreign government controls/governs the territory from within the land being colonized. • Little to no new settlement established on fresh territory. • Movement to settle to fresh territory. Age of Colonialism WHEN? • Started around the late 1400s and ended around the late 1700s/early 1800s. WHY? • Primary Reason: European countries, wished to find a direct trade route to Asia (China & India) and the East Indies. o Quicker and relatively more effective than land routes over Asia. • Secondary Reason: Empire expansion (land power) WHO? • Countries involved: Great Britain, France, Spain, the Dutch & Portugal. • Individuals’ knowns as Mercantilists believed that maintaining imperialized territory and colonizing the region could serve as a source of wealth, while personal motives by rulers, explorers, and missionaries could therefore promote their own agenda. o This agenda being “Glory, God and Gold”. Mercantilism • Mercantilism was a popular and main economic system for many European nations during the 16th to 18th centuries. • The main goal was to increase a nation’s wealth by promoting government rule of a nation’s economy for the purpose of enhancing state power at the expense of rival national power. • It was the economic counterpart of political absolutism. Why did mercantilists want colonies? • Mercantilists believed that a country must have an excess of exports over imports. • By colonizing territory, it provided the nation with indispensable wealth of precious raw materials. • Therefore, the claimed territory served as a market and supplier of raw materials for the mother country. Which, in time, provided an excess of exports for the nation and thus created wealth. o Development of Trading Companies to support this economic system. Hudson Bay Company – (1670). Controlled primarily North America. o Dutch East Indie Trading Company (1682) o East Indian Trading Company (1600) o Royal African Trade Company (1672) WHERE? • European nations begun to colonize the America, India and the East Indies to create a direct trade route. • Great Britain was the leading power in India, Australia and North America, South Africa. • Spain colonized central and South America. • French held Louisiana, coastal land of Africa and French Guinea. • The Dutch built an empire in the East Indies. • The Portuguese was able to take control of present-day Brazil and the southern tip of South America and Japan. Age of Colonialism • As countries started to imperialize these regions, eventually the concept of colonization took hold: • This is what makes the Age of Colonialism extremely different! End of Colonialism • By 1800, colonialism became less popular • Why? o Revolutions (Spain, France & American) o The Napoleonic Wars o Struggle for nationalism and democracy. o Exhausted all money and energy to supervise their colonies. Waiting to wake again • Imperialism would stay quiet for close to 50 years before Great Britain and France’s economies revitalized. • The outbreak of the Industrial Revolution only encouraged and revitalized European nations to begin their conquest for new territory and resources. Age of Imperialism THE SCRAMBLE FOR AFRICA 1870-1914 Conditions Prior to Imperialism of Africa  European interest in exploiting Africa was minimal.  Their economic interests & profit in Africa primarily came through coastal trade that took place during the 1500-1700s.  The slave trade became the main source of European profit.  Furthermore, disease, political instability, lack of transportation and unpredictable climate all discouraged Europeans from seeking territory. Slave Trade & the Trans-Atlantic Slave Voyages  Forced labor was not uncommon during the 13-17th Centuries. Africans and Europeans had been trading goods and people across the Mediteranea for centuries.  This all changed from 1526 to 1867, as a new system of slavery was introduced that became highly “commercialized, racialized and inherited”  By 1690, the America and West Indies saw approximately 30,000 African people shipped from Africa. A century later, that number grew to 85,000 people per year.  By 1867, approximately 12.5 million people (about twice the population of Arizona) left Africa in a slave ship. What Changed? 1. End of the Slave Trade- Left a need for trade between Europe and Africa. 2. Innovation in technology- The steam engine and iron hulled boats allowed Europe 3. Discovery of new raw materials- Explorers located vast raw materials and resources and this only spurred imperialism with Europe in the wake of the Industrial Revolution. 4. Politics- Unification of Germany and Italy left little room to expand in Europe. Germany and Italy both needed raw materials to “catch up” with Britain and France so they looked to Africa. The Scramble for Africa  The scramble started in 1870.  Although some coastal land had previously been acquired before 1870, the need for territory quickly accelerated as European countries looked t get deeper into Africa.  Within 20 years, nearly all continents were placed under imperialistic rule. Who was Involved?  Great Britain  France  Germany  Italy  Portugal  Belgium  Spain (kind) Violent Affairs  Violence broke out multiple times when European nations looked to claim the same territory.  Germ Chancellor. Otto van Bismarck. Attempted to avert the possibility of violence against the European powers.  In 1884, Bismarck organized a conference in Berlin for the European nations. The Berlin Conference (1884-85)  The conference looked to set ground rules for future annexation of African territory by European Nations.  Annexation is the forcible acquisition and assertion of legal title over one state’s territory by another state, usually following military occupation of the territory.  From a distant perspective, it looked like it would reduce tensions among European nations and avert war.  At the heart of the meeting, these European countries negotiated their claims to African territory, made it official and then mapped their regions.  Furthermore, the leaders agreed to allow free trade among imperialized territory and some homework for negotiating future European claims in Africa was established. Further Path  After the conference, european powers continued to expand their claims in Africa so that by 1900. 90% of the African territory had been claimed. A Turn towards Colonization?  Upon the imperialization of African territory, European nations and little interest in African land unless it produced economic wealth.  Therefore, European governments put little effort and expertise into these imperialized regions.  In most cases, this emat a form of indirect rule. Thus, governing the natin without sufficient settlement and government from within the mother country. Some Exceptions  There were some exemptions through in Africa as colonization was a necessary for some regions i n Africa.  Some regions where diamonds and gold were present. Government looked to protectorate the regions and establish rule and settlement in the regions.  Protectorates: A state controlled and protected by another state for defense against aggression and other law violations. Would  Some examples include South Africa, Botswana, Zimbabwe and Congo. Conclusion  Although it may appear that the Berlin Conference averted war amid the African Scramble, imperialism eventually brought the world into worldwide conflict.  With the continued desire to create an empire by European nations. World War 1 would break out which can be linked to this quest at imperialism.
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Physics

  • Thermodynamics:

    • Study of energy transfer as work and heat

    • Relationship between heat, temperature, energy, and work

    • Origin of the word from Greek: "therme" for heat and "dynamis" for force

  • Temperature on Molecular Level:

    • Kinetic molecular theory explains temperature

    • Temperature measures average kinetic energy of atoms and molecules

    • Higher temperature means more kinetic energy among atoms or molecules

  • Temperature Measurement:

    • Different temperature scales and conversions

    • Kelvin as the unit for absolute temperature

    • Absolute zero as the lowest energy state

  • Instrument to Measure Temperature:

    • Types of thermometers: digital, tympanic, infrared, strip-type, mercury, clinical, laboratory

  • Everyday Physics Integration: Heat Index

    • Heat index combines air temperature and humidity

    • Impact on human body's comfort and cooling mechanisms

    • High heat index poses risks like cramps, heat exhaustion, and heat stroke

  • Heat (Energy) and Internal Energy:

    • Heat is energy in transit between bodies with different temperatures

    • Heat flows from high to low temperature areas

    • Internal energy includes both kinetic and potential energy of molecules

  • Internal energy (U) is the total kinetic and potential energy of particles in a system

    • Directly proportional to temperature

    • Higher temperature means more internal energy, lower temperature means less

  • Comparison between objects A and B

    • A has 4 times the amount of substance compared to B

    • Both have the same temperature, so the average kinetic energy of molecules is the same

    • Object B has more internal energy due to having 4 times the substance

  • Comparison between two objects

    • The Venti has 2 times the amount of substance compared to the other

    • Venti has more internal energy due to the larger amount of substance

  • Doubling the amount of coffee

    • Doubling the size does not double the temperature but doubles the internal energy

  • Internal energy can do work through pressure-volume work by expanding gas

  • Temperature is a measure of heat energy available to do work in a system

  • Internal energy can also do work through heat transfer

  • Summary of quantities

    • Temperature: average kinetic energy of molecules, basic property of matter

    • Internal energy (U): total energy of molecules, proportional to temperature

    • Heat (Q): energy in transit, depends on temperature difference, substances do not contain heat

  • Practice exercise: temperature change of mercury from -73oC to 723oC

    • Express temperature change in kelvin and Fahrenheit degrees

Additional Information

  • Temperature is an intensive property, while internal energy is an extensive property

  • Internal energy is in Joules, heat is in Joules or Calories

  • Temperature change can be converted to Kelvin and Fahrenheit degrees

T3.2: Heat and Heat Effects

Terms:

  1. Temperature: Measure of the average kinetic energy (KE) of molecules of an object, indicating how "hot" the object is.

  2. Heat: Total kinetic energy (KE) and potential energy (PE) of the molecules in an object, transferred from one body to another due to a difference in temperature.

  3. Internal Energy (U): Total amount of KE and PE of all the particles in the system.

  4. Heat Capacity: Amount of heat needed to change the temperature of an object by a degree, measured in joules per degree Celsius (J/Kg.C).

Equations/Formulae:

  1. Heat Capacity formula: C = mc, where C is the heat capacity, m is the mass, and c is the specific heat in J/Kg.C.

  2. Specific Heat: The amount of heat needed to change the temperature of a unit mass of a substance by 1 degree.

  3. Specific Latent Heat of Fusion: The amount of thermal energy required to change the state of 1 kg of a substance from solid to liquid or vice versa.

  4. Specific Latent Heat of Vaporization: The amount of thermal energy required to change the state of 1 kg of a substance from liquid to gas or vice versa.

These terms and equations/formulas are used to explain the relationship between temperature, heat, and internal energy, as well as the effects of heat transfer, expansion, and changes in state of matter.

expound on the equations/formulas mentioned in the document:

  1. Heat Capacity Formula:

    • The heat capacity (C) of an object is given by the formula C = mc, where:

      • C = heat capacity (in joules per degree Celsius, J/Kg.C)

      • m = mass of the object (in kilograms, kg)

      • c = specific heat of the material (in joules per kilogram per degree Celsius, J/Kg.C)

    • This formula is used to calculate the amount of heat needed to change the temperature of an object by a degree.

  2. Specific Heat:

    • Specific heat (c) is the amount of heat needed to change the temperature of a unit mass of a substance by 1 degree.

    • It is a property of the material and is measured in joules per kilogram per degree Celsius (J/Kg.C).

    • The specific heat of a substance determines how much heat is required to change its temperature.

  3. Specific Latent Heat of Fusion:

    • The specific latent heat of fusion (L) is the amount of thermal energy required to change the state of 1 kg of a substance from solid to liquid or vice versa.

    • It is measured in joules per kilogram (J/kg).

    • This energy is absorbed or released during the phase change from solid to liquid or vice versa.

  4. Specific Latent Heat of Vaporization:

    • The specific latent heat of vaporization (Lv) is the amount of thermal energy required to change the state of 1 kg of a substance from liquid to gas or vice versa.

    • It is also measured in joules per kilogram (J/kg).

    • This energy is absorbed or released during the phase change from liquid to gas or vice versa.

examples:

  1. Heat Capacity Formula: Example: Given:

    • Mass (m) = 2.0 kg

    • Specific heat (c) of aluminum = 900 J/kg.C (a) Calculate the heat capacity of aluminum. Solution: Using the formula C = mc, we can calculate the heat capacity: C = (2.0 kg) * (900 J/kg.C) = 1800 J/C Therefore, the heat capacity of the aluminum object is 1800 J/C.

    (b) Calculate the amount of heat needed to change the temperature of the object from 25°C to 35°C. Solution: The change in temperature (ΔT) = 35°C - 25°C = 10°C Using the heat capacity (C) calculated in part (a): Heat (Q) = C ΔT Q = 1800 J/C 10°C = 18000 J Therefore, the amount of heat needed to change the temperature of the object from 25°C to 35°C is 18000 J.

  2. Specific Latent Heat of Fusion: Example: Given:

    • Specific latent heat of fusion (L) for ice = 334,000 J/kg If 1 kg of ice at 0°C is completely melted to water at 0°C, calculate the amount of heat absorbed. Solution: The amount of heat absorbed during the phase change from solid to liquid is given by: Heat (Q) = mass specific latent heat of fusion Q = 1 kg 334,000 J/kg = 334,000 J Therefore, the amount of heat absorbed during the melting of 1 kg of ice is 334,000 J.

  3. Specific Latent Heat of Vaporization: Example: Given:

    • Specific latent heat of vaporization (Lv) for water = 2,260,000 J/kg If 1 kg of water at 100°C is completely vaporized to steam at 100°C, calculate the amount of heat absorbed. Solution: The amount of heat absorbed during the phase change from liquid to gas is given by: Heat (Q) = mass specific latent heat of vaporization Q = 1 kg 2,260,000 J/kg = 2,260,000 J Therefore, the amount of heat absorbed during the vaporization of 1 kg of water is 2,260,000 J.

T3.3: Conditions Necessary for HeatTransfer to Occur

Terms:

  1. Heat: The energy that flows from one body to another due to a temperature difference.

  2. Conduction: The transfer of heat through a diffusive process wherein molecules transmit their kinetic energy to other molecules by colliding with them.

  3. Convection: The transfer of heat associated with the motion of the medium, such as when a hot material flows into a cold material.

  4. Radiation: The transfer of heat via electromagnetic radiation, such as the radiation from the Sun.

Equations/Formula:

  1. Q = mcΔT: The equation for calculating heat transfer, where Q is the heat transferred, m is the mass, c is the specific heat, and ΔT is the change in temperature.

  2. Specific Heat (c): The specific heat of a substance is the amount of heat required to raise the temperature of a unit mass of the substance by one degree Celsius.

The document also includes sample problems involving specific heat and heat transfer, providing a practical application of the concepts discussed.

The formula Q = mcΔT is used to calculate the amount of heat transferred. Here's an explanation of the formula and some examples:

Explanation of the Formula:

  • Q represents the amount of heat transferred, measured in joules (J).

  • m represents the mass of the substance, measured in kilograms (kg) or grams (g).

  • c represents the specific heat capacity of the substance, measured in joules per kilogram per degree Celsius (J/kg°C) or joules per gram per degree Celsius (J/g°C).

  • ΔT represents the change in temperature, measured in degrees Celsius (°C) or Kelvin (K).

The formula essentially states that the amount of heat transferred (Q) is equal to the product of the mass (m), the specific heat capacity (c), and the change in temperature (ΔT) of the substance.

Examples:

  1. Example of Using the Formula for Water:

    • Suppose we have 1 kg (1000 g) of water and we want to raise its temperature by 10°C.

    • The specific heat capacity of water is approximately 4186 J/kg°C.

    • Using the formula Q = mcΔT: Q = (1000 g) (4186 J/kg°C) (10°C) Q = 41,860 J

    • Therefore, it would require 41,860 joules of heat to raise the temperature of 1 kg of water by 10°C.

  2. Example of Using the Formula for a Metal:

    • Consider a 500 g piece of metal with a specific heat capacity of 500 J/kg°C. If the temperature of the metal increases by 50°C, we can calculate the heat transfer.

    • Using the formula Q = mcΔT: Q = (500 g) (500 J/kg°C) (50°C) Q = 12,500 J

    • Therefore, it would require 12,500 joules of heat to raise the temperature of the metal by 50°C

T3.4: Using Heat to do Work

Terms:

  1. Thermodynamics: The study of heat and its transformations to other forms of energy, such as mechanical, electrical, or chemical, and vice versa.

  2. Mechanical Equivalent of Heat: The quantitative relationship between heat and work, established by James Prescott Joules.

  3. Heat Engine: A device that changes heat energy to mechanical work continuously.

  4. 1st Law of Thermodynamics: The law stating that the internal energy of a system is affected by the heat it absorbs (or releases) and the work done by the system or work done on the system.

Equation/Formula:

  1. 1st Law of Thermodynamics Equation: ΔU = Q - W

    • ΔU: Change in internal energy

    • Q: Heat transferred into the system

    • W: Work done on or by the system

  2. Relationship between Internal energy, Heat, and Work:

    • The total increase (or decrease) in the thermal energy of the system is equal to the total work done on (or by) it and the heat added (or removed) to it.

  3. Conversion of Work to Heat: W = JQ

    • W: Work done

    • J: Mechanical equivalent of heat

    • Q: Heat developed

  1. 1st Law of Thermodynamics Equation: ΔU = Q - W

    • ΔU: Change in internal energy

    • Q: Heat transferred into the system

    • W: Work done on or by the system

    Example: Suppose a closed system absorbs 150 J of heat and does 100 J of work. How much would be the change in internal energy? Solution: ΔU = Q - W ΔU = 150 J - 100 J ΔU = 50 J

  2. Relationship between Internal energy, Heat, and Work:

    • The total increase (or decrease) in the thermal energy of the system is equal to the total work done on (or by) it and the heat added (or removed) to it.

    Example: A closed thermodynamics system absorbs 100 J of heat, resulting in a net-zero change in its internal energy. How much work is involved in this process? Identify whether the work is done on or by the system. Solution: ΔU = 0 Q = 100 J ΔU = 0 W = ? ΔU = Q - W 0 = 100 J - W W = 100 J (work is done by the system)

  3. Conversion of Work to Heat: W = JQ

    • W: Work done

    • J: Mechanical equivalent of heat

    • Q: Heat developed

    Example: Suppose that by rubbing your hands, you perform 4500 J of work against friction. How much heat in calories did you generate? Solution: W = 4500 J J = 4.186 J/cal (mechanical equivalent of heat) Q = W / J Q = 4500 J / 4.186 J/cal Q ≈ 1075 cal

Continuation of 3.4

  1. Thermodynamics: The study of the relationships between heat, work, and energy.

  2. Internal Energy: The sum of kinetic and potential energies of a system's particles and their interactions.

  3. Heat: The transfer of thermal energy from a hotter object to a colder object.

  4. Work: The transfer of energy that results in a change in the state of a system.

  5. Heat Engine: A device that converts heat energy into mechanical work continuously.

  6. 1st Law of Thermodynamics: States that the total increase or decrease in the thermal energy of a system is equal to the total work done on or by it and the heat added to it.

Equations and Formulas:

  1. 1st Law of Thermodynamics Equation: ΔU = Q - W

    • ΔU: Change in internal energy

    • Q: Heat added to the system

    • W: Work done by the system

  2. Specific Heat Equation: Q = mcΔT

    • Q: Heat added or removed

    • m: Mass of the substance

    • c: Specific heat capacity

    • ΔT: Change in temperature

  3. Mechanical Equivalent of Heat: J = 4.186 J/cal

    • J: Mechanical energy or work done

    • cal: Calorie, a unit of heat

  4. Relationship between Internal energy, Heat, and Work:

    • ΔU = Q - W

    • (+) Q: Heat transfers INTO the system

    • (-) Q: Heat transfers OUT of the system

    • (+) W: Work is DONE BY the system

    • (-) W: Work is DONE ON the system

  5. Heat Engine Operation:

    • Thermal energy is introduced into the engine.

    • Some of this energy is converted to mechanical work.

    • Some heat (waste heat) is released into the environment at a lower temperature.

  1. 1st Law of Thermodynamics Equation: ΔU = Q - W

    • ΔU: Change in internal energy

    • Q: Heat added to the system

    • W: Work done by the system

    Example: Suppose a closed system absorbs 150 J of heat and does 100 J of work. How much would be the change in internal energy? Solution: ΔU = Q - W ΔU = 150 J - 100 J ΔU = 50 J Result: The change in internal energy is 50 J.

  2. Specific Heat Equation: Q = mcΔT

    • Q: Heat added or removed

    • m: Mass of the substance

    • c: Specific heat capacity

    • ΔT: Change in temperature

    Example: Calculate the change in temperature of 1.0 kg of water that is initially at room temperature (22°C) if 3.0 kJ of heat is added. Solution: Q = 3000 J (3.0 kJ = 3000 J) m = 1.0 kg c = 4186 J/kg°C (specific heat of water) ΔT = Q / (mc) ΔT = 3000 J / (1.0 kg * 4186 J/kg°C) ΔT ≈ 0.716°C Result: The change in temperature is approximately 0.716°C.

  3. Relationship between Internal energy, Heat, and Work: ΔU = Q - W

    • ΔU: Change in internal energy

    • Q: Heat added to the system

    • W: Work done by the system

    Example: A closed thermodynamics system absorbs 100 J of heat, resulting in a net-zero change in its internal energy. How much work is involved in this process? Identify whether the work is done on or by the system. Solution: ΔU = 0 Q = 100 J ΔU = Q - W 0 = 100 J - W W = 100 J Result: 100 J of work is done by the system.

T3.5: Heat Engines and Thermal Efficiency

erms:

  1. Heat Engine: A device that converts thermal energy into other forms of energy, such as mechanical or electrical energy. It is a cyclic device that starts and returns to the same thermodynamic state.

  2. Adiabatic Process: A process in which a gas is compressed or expanded without any heat entering or leaving the system.

  3. Thermal Efficiency: A measure of how well an engine operates, indicating how well a heat engine converts heat into useful work.

Equations/Formula:

  1. Thermal Efficiency (Eff) = (Output energy - mechanical work done) / Input energy (heat QH from the hot reservoir) x 100%

  2. Ideal Efficiency of a Carnot Engine: Eff = (QH - QC) / QH x 100%

  3. Kelvin to Celsius conversion: Kelvin = Celsius + 273.15

  4. Sample Problem 1: An engine takes in 8000 J and discards 4400 J of heat. a) Mechanical work = 3600 J, b) Thermal efficiency = 45%

  5. Sample Problem 2: A heat engine performs 9,200 J of mechanical work while discarding 4500 J to the heat sink. a) Heat absorbed from the hot reservoir, b) Efficiency of the engine.

  1. Thermal Efficiency (Eff) = (Output energy - mechanical work done) / Input energy (heat QH from the hot reservoir) x 100%

    • This formula measures how well an engine operates by indicating how well a heat engine converts heat into useful work. It compares the output energy (mechanical work done) to the input energy (heat absorbed from the hot reservoir).

    Example: If an engine takes in 10,000 J of heat and performs 4,000 J of mechanical work, the thermal efficiency would be: Eff = (10,000 J - 4,000 J) / 10,000 J x 100% = 60%

  2. Ideal Efficiency of a Carnot Engine: Eff = (QH - QC) / QH x 100%

    • This formula calculates the ideal efficiency of a Carnot engine, which operates between two temperatures, a hot temperature (Th) and a cold temperature (Tc) expressed in Kelvin.

    Example: If a Carnot engine absorbs 2000 J of heat from the hot reservoir and discards 800 J to the cold reservoir, the ideal efficiency would be: Eff = (2000 J - 800 J) / 2000 J x 100% = 60%

  3. Kelvin to Celsius conversion: Kelvin = Celsius + 273.15

    • This formula is used to convert temperatures from Celsius to Kelvin.

    Example: If the temperature is 25°C, it can be converted to Kelvin as: Kelvin = 25°C + 273.15 = 298.15 K

  1. Second Law of Thermodynamics: The Second Law of Thermodynamics states that in any energy transfer or transformation, the total entropy of a closed system will always increase over time. This law implies that processes occur in a particular direction and that not all energy can be converted into useful work. It also introduces the concept of irreversibility in natural processes, highlighting limitations on energy conversion efficiency.

  2. Equation of Thermal Efficiency: The thermal efficiency of a system is a measure of how effectively it converts input energy into useful work or output. The equation for thermal efficiency is given by: Efficiency = (Useful output energy / Input energy) * 100%. This formula quantifies the ratio of useful work produced by a system to the total input energy supplied to the system.

  3. Ideal Efficiency: Ideal efficiency refers to the maximum possible efficiency that a system can achieve under ideal conditions, without any energy losses. It represents the theoretical upper limit of efficiency for a given process or device. Achieving ideal efficiency is often impossible in real-world scenarios due to factors such as friction, heat loss, and other inefficiencies.

  4. Heat Pump: A heat pump is a device that transfers heat from a colder space (or source) to a warmer space (or sink) by using mechanical work. Heat pumps operate based on the principles of thermodynamics, specifically the transfer of heat from a low-temperature reservoir to a high-temperature reservoir. They are commonly used for heating or cooling applications in buildings, refrigeration systems, and industrial processes.

T3.6: Electrical Generation, Transmission and Distribution

  • A heat engine is used to generate electricity

  • Sources of Electrical Energy: Providing Fuel → Igniting Fuel → Fuel being superheated → Driving the turbine → Generating Electricity

  • Companies that generate electricity:

    • National Power Corporation (Napocor)

    • Philippine National Oil Company-Energy Development Corporation (PNOC-EDC)

    • Aboitiz Power

    • First Gen Corporation

  • A power plant or power station is where electricity is generated

    • Thermal

      • Thermal power plants convert thermal energy (heat) into electrical energy. They typically use fossil fuels like coal, natural gas, or oil to generate steam, which drives a turbine connected to a generator to produce electricity.

    • Kinetic

      • Kinetic power plants, on the other hand, convert the kinetic energy of moving fluids (such as wind or flowing water) into electrical energy. Wind turbines and hydroelectric power plants are examples of kinetic power plants

    • Source of energy → turn of turbine → rotation of coils or magnets of generator → production of electricity

    • The basic components of electricity generation are:

      1. Turbines – shaft with rotating blades

      2. Generators – consist of powerful electromagnets surrounded by coils converting mechanical to electrical energy

      3. Transformers – a device that lowers or raises the voltage of an(AC)ALTERNATING CURRENT source.

      Alternating Current (AC) is a type of electrical current, in which the direction of the flow of electrons switches back and forth at regular intervals or cycles.

      Sources of Electrical energy:

      1. Renewable resources – can be replenished naturally

      2. Non-renewable resources – more rapidly used than formed.

      Electricity undergoes a series of processes before it reaches us. Electricity is generated in a power plant. Transformed to higher-voltage electricity at substations Sent to the transmission network Reduced and transmitted to the distribution companies. The distributors bring power to millions of consumers. An electrical grid is useful in balancing an electricity transmission system

    1. Electrical generation:

    • The process of converting mechanical, chemical, or other forms of energy into electrical energy.

    • Key methods of generation include fossil fuel power plants, nuclear power plants, hydroelectric power plants, solar power, wind power, and geothermal power.

    • Generation capacity is measured in watts or kilowatts (kW), and the total amount of electricity generated over time is measured in kilowatt-hours (kWh).

    • Efficiency, capacity factor, and availability are important metrics for evaluating the performance of generation facilities.

    1. Electrical transmission:

    • The process of moving electricity from power plants to substations or distribution centers over long distances.

    • High-voltage transmission lines are used to minimize energy losses during transport.

    • Transformers are used to step up voltage for efficient transmission and step down voltage for distribution.

    • Grid infrastructure, including substations and control systems, plays a crucial role in managing the flow of electricity across the transmission network.

    1. Electrical distribution:

    • The final stage of delivering electricity to end-users, including residential, commercial, and industrial customers.

    • Distribution networks consist of low-voltage lines, transformers, and distribution substations.

    • Smart grid technologies enable efficient monitoring, control, and optimization of distribution systems.

    • Reliability, voltage regulation, and power quality are important considerations in distribution system design and operation.

    Overall, the integration of generation, transmission, and distribution systems is essential for ensuring a reliable and efficient supply of electricity to meet the needs of consumers and support economic development.

T3.7 Magnetism and T3.8: Induction of Electricity by Magnetism

  • Protons and electrons are oppositely charged that react to both electric and magnetic fields

  • No electromagnetic force means atoms and molecules would never form

  • Electromagnetism is the force exerted between electric charges on one another, and it is a branch of physics dealing with the study of electromagnetic force.

  • Magnets produce a magnetic field and can attract or repel other materials containing iron.

    • Ferromagnetic

      • strongly attracted to magnets

    • Paramagnetic

      • Slightly attracted by strong magnets

    • Diamagnetic

      • Repelled by strong magnets

  • Magnetic field lines emerge from the North pole and merge at the South pole of a magnet. → magnetic force (The force exerted by a magnet on another magnet or a magnetic material.)

    • A region around a magnet where magnetic forces are experienced.

    • The regions of a magnet where the magnetic field is strongest, typically labeled as the north and south poles, are the magnetic poles

  • An electric current creates a magnetic field in the surrounding space, leading to the discovery of electromagnets.

  • Electromagnets are magnets that run on electricity and can be turned on and off by changing the amount of electric current that flows through them.

    • A temporary magnet created by passing an electric current through a coil of wire wrapped around a magnetic material.

  • Due to the Earth’s Magnetosphere, this allows compasses to work and protect us from radiation from cosmic rays

  • Magnetic domain: A region within a magnetic material where the magnetic moments of atoms are aligned in the same direction.

Key Terms with Explanation:

  1. Electromagnetism: The force exerted between electric charges on one another, and a branch of physics dealing with the study of electromagnetic force.

  2. Magnetic field: The area around a magnet that has a magnetic force, with field lines emerging from the North pole and merging at the South pole.

  3. Magnetic flux: The number of magnetic field lines per area, indicating the strength of the magnet.

  4. Electromagnets: Magnets that run on electricity and can be turned on and off by changing the amount of electric current that flows through them.

    • Increase power: increase the current, add loops on the solenoid

Induction of electricity:

  1. Electromagnetic induction: The process of generating an electromotive force (emf) or voltage in a conductor by changing the magnetic field around it.

  2. Faraday's law: States that the induced emf in a circuit is directly proportional to the rate of change of magnetic flux through the circuit.

  3. Lenz's law: States that the direction of the induced current in a circuit is such that it opposes the change in magnetic flux that produced it.

  4. Transformer: A device that uses electromagnetic induction to transfer electrical energy from one circuit to another through a changing magnetic field.

  5. Induction coil: A device that uses electromagnetic induction to produce high-voltage pulses for applications such as spark plugs in internal combustion engines.

  • A magnetic field around the wire coil is created every time an electric current flows through a wire

Terms and Explanations:

  1. Electromagnetic Induction: The process of generating an electromotive force (emf) in a closed circuit by the relative motion of a magnet and a conductor, leading to the production of an induced current.

  2. Electromagnet: A magnet that runs on electricity, created by passing an electric current through a wire coil to produce a magnetic field.

  3. Electric Motor: A device that converts electrical energy into mechanical energy by utilizing the interaction between electricity and magnetism to produce motion.

  4. Generator: An electrical device that uses the principle of electromagnetic induction to convert mechanical energy into electrical energy by moving a wire near a magnet to create a flow of current.

  5. Transformer: An electrical device that uses electromagnetic induction to transfer energy from one electric circuit to another, often changing the voltage and electric current.

T3.9: Types of Charges

Summary of Terms:

  1. Electric Charge: An electrical property of matter that creates a force between objects. It can be positive, negative, or neutral (no net charge).

  2. Electrostatics: The study of electric charges at rest under the influence of electric forces.

  3. Grounding (Earthing): Allowing a path for charges to flow between a charged object and the earth, removing or balancing its excess charge.

  4. Lightning Rods: Devices that provide a path for electrons in the air to flow from the top of a building to the earth, protecting the building from lightning damage.

Explanation:

  1. Electric Charge: It is an inherent property of matter that results in the attraction or repulsion between objects. It can be positive, negative, or neutral, and it creates an electric force between charged objects.

    • objects are neutral at nature

    • Lose electrons = positive charge

    • Gain electrons = negative charge

    • Law of electric charges: Unlike attracts, like repels

  2. Electrostatics: This is the branch of physics that deals with the interactions of static (non-moving) electric charges, involving forces between charged objects.

  3. Law of Conservation of Charge

    • Charges cannot be created nor destroyed but can be transferred from one material to another. Total change in system is constant.

    • Electrons are the one freely moving

Charging processes:

  1. Friction

    • Objects with less affinity for electrons will lose electrons (becomes positively charge) to one with greater affinity. Less affinity means it can easily lose electrons and gain less electrons but higher affinity means it will lose less electrons but will gain more electrons.

  2. Conduction

    • Transfer of electrons by direct contact

    • When two objects with different electric potentials come into contact, electrons can move from the object with a higher potential to the object with a lower potential.

  3. Induction

    • Polarization means to induce a charge

    • rearrangement of electrons within a neutral object when it is brought near a charged object, without direct contact between the two objects.

    • It is important to note that the neutral object does not actually gain or lose electrons during the induction process.

  1. Grounding (Earthing): This is a safety measure that allows excess charges on an object to flow to the earth, preventing electric shocks and balancing the charge.

  2. Lightning Rods: These are devices used to protect buildings from lightning damage by providing a path for the flow of electrons from the top of the building to the earth, preventing electric surges, fires, and explosions.

T3.10: Ohm’s Law

Complete Circuit

  • Current can flow all the way around

  • An electric circuit is a complete closed path through which electric charges can flow

parts of circuit:

  1. Energy source

  2. Electrical conductor

  3. Load

Ohm's law states that the current flowing through a conductor is directly proportional to the voltage applied across it, and inversely proportional to the resistance of the conductor.

Key terms:

  1. Current (I) - The flow of electric charge through a conductor, measured in amperes (A).

  2. Voltage (V) - The electrical potential difference between two points in a circuit, measured in volts (V).

  3. Resistance (R) - The opposition to the flow of electric current in a conductor, measured in ohms (Ω).

Example: If a circuit has a voltage of 12 volts applied across a resistor with a resistance of 4 ohms, the current flowing through the resistor can be calculated using Ohm's law: I = V/R I = 12V / 4Ω I = 3A. Therefore, the current flowing through the resistor is 3 amperes.

Table of Vocabulary:

A conductor is a material that allows the flow of electric current through it. Conductors have a high density of free electrons that are able to move easily in response to an applied electric field.

Voltage is the force that drives electric current through a conductor.

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Imperialism Rise in Nationalism • During the French and Industrial Revolution, nationalism continued to inspire nations to increase their political and economic power. • Nationalism became the ideal force in the political, economic, and cultural life in the world, becoming the first universal ideology-organizing all people into a nation state. Nationalism Defined • The strong belief that the interest of a particular nation-state is of primary importance. o Nation-State – a state where the vast majority shares the same culture and is conscious of it. It is an ideal in which cultural boundaries match up with political ones. • As an ideology, it is based on the idea that the individual’s loyalty and devotion to the nation-state surpass other individual/group interests. • Exalting one nation’s belief above all others and placing primary emphasis on promotion of its culture and interests, excluding the interests of others. Changing the World through a Nationalistic Vision • The French Revolution significantly changed the political world and how countries govern. • The Industrial Revolution significantly changed the economic world. • The Age of Imperialism (1870-1914) dramatically changed the political, economic, and social world. What is Imperialism? • Imperialism- The policy of extending the rule of authority of an empire or nation over foreign countries, or of acquiring and holding colonies and dependencies. Power and influence are done through diplomacy or military force. Reasons for Imperialism • There are 5 main motives for empires to seek to expand their rule over other countries or territories: 1. Exploratory • Imperial nations wanted to explore territory unknown to them. • The main purpose for this exploration of new lands was for resource acquisition, medical or scientific research. o Charles Darwin • Other reasons: o Cartography (map making) o Adventure 2. Ethnocentric • Europeans acted on the concept of ethnocentrism o Ethnocentrism- the belief that one race or nation is superior to others. • Ethnocentrism developed out of Charles Darwin’s “survival of the fittest” theory. Philosophers used the theory to explain why there were superior races and inferior races. o This became known as Social Darwinism. • Most imperial nations believed that their cultural values or beliefs were superior to other nations or groups. • Believed imperial conquest would bring successful culture to inferior people. 3. Religious • Imperial expansion promoted a religious movement of people setting out to convert new members of conquered territories. • With the belief that Christianity was superior, missionaries believed it was their duty to spread Christianity to the world. • Christian missionaries established churches, and in doing so, they spread Western culture values as well. • Typically, missionaries spread the imperial nation's language through education and religious interactions. 4. Political • Patriotism and Nationalism helped spur our imperial growth, thus creating competition against other supremacies. • It was a matter of national pride, respect, and security. • Furthermore, European rivalry spurred nations for imperial conquest. Since land equaled power, the more land a country could acquire the more prestige they could wield across the globe. • Empires wanted strategic territory to ensure access for their navies and armies around the world. • The empire believed they must expand, thus they needed to be defended. 5. Economic • With the Industrial Revolution taking place during the same time, governments and private companies contributed to find ways to maximize profits. • Imperialized countries provided European factories and markets with natural resources (old and new) to manufacture products. • Trading posts were strategically placed around imperialized countries to maximize and increase profits. o Such places as the Suez Canal in Egypt which was controlled by the British provided strategic choke hold over many European powers. o Imperial powers competed over the best potential locations for resources, markets, and trade. History of Imperialism • Ancient Imperialism 600 BCE-500 CE o Roman Empire, Ancient China, Greek Empire, Persian Empire, Babylonian Empire. • Middle Age Imperialism (Age of Colonialism-1400-1800s) o Great Britain, Spain, Portugal, France, Netherlands (Dutch), Russia. • Age of Imperialism 1870-1914 o Great Britain, Spain, Portugal, France, Germany, Belgium, Italy, Japan, United States, Ottoman Empire, Russia. • Current Imperialism...? o U.S. Military intervention (i.e. Middle East) o Russia’s Invasion of Ukraine. Imperialism Colonialism • Refers to political or economic control, either legally or illegally. • Refers to where one nation assumes control over the other. • Creating an empire, expanding into neighboring regions and expanding the dominance far outside its borders. • Where a country conquers and rules over other regions for exploiting resources from the conquered country for the conqueror's benefit. • Foreign government controls/governs a territory without significant settlement. • Foreign government controls/governs the territory from within the land being colonized. • Little to no new settlement established on fresh territory. • Movement to settle to fresh territory. Age of Colonialism WHEN? • Started around the late 1400s and ended around the late 1700s/early 1800s. WHY? • Primary Reason: European countries, wished to find a direct trade route to Asia (China & India) and the East Indies. o Quicker and relatively more effective than land routes over Asia. • Secondary Reason: Empire expansion (land power) WHO? • Countries involved: Great Britain, France, Spain, the Dutch & Portugal. • Individuals’ knowns as Mercantilists believed that maintaining imperialized territory and colonizing the region could serve as a source of wealth, while personal motives by rulers, explorers, and missionaries could therefore promote their own agenda. o This agenda being “Glory, God and Gold”. Mercantilism • Mercantilism was a popular and main economic system for many European nations during the 16th to 18th centuries. • The main goal was to increase a nation’s wealth by promoting government rule of a nation’s economy for the purpose of enhancing state power at the expense of rival national power. • It was the economic counterpart of political absolutism. Why did mercantilists want colonies? • Mercantilists believed that a country must have an excess of exports over imports. • By colonizing territory, it provided the nation with indispensable wealth of precious raw materials. • Therefore, the claimed territory served as a market and supplier of raw materials for the mother country. Which, in time, provided an excess of exports for the nation and thus created wealth. o Development of Trading Companies to support this economic system. Hudson Bay Company – (1670). Controlled primarily North America. o Dutch East Indie Trading Company (1682) o East Indian Trading Company (1600) o Royal African Trade Company (1672) WHERE? • European nations begun to colonize the America, India and the East Indies to create a direct trade route. • Great Britain was the leading power in India, Australia and North America, South Africa. • Spain colonized central and South America. • French held Louisiana, coastal land of Africa and French Guinea. • The Dutch built an empire in the East Indies. • The Portuguese was able to take control of present-day Brazil and the southern tip of South America and Japan. Age of Colonialism • As countries started to imperialize these regions, eventually the concept of colonization took hold: • This is what makes the Age of Colonialism extremely different! End of Colonialism • By 1800, colonialism became less popular • Why? o Revolutions (Spain, France & American) o The Napoleonic Wars o Struggle for nationalism and democracy. o Exhausted all money and energy to supervise their colonies. Waiting to wake again • Imperialism would stay quiet for close to 50 years before Great Britain and France’s economies revitalized. • The outbreak of the Industrial Revolution only encouraged and revitalized European nations to begin their conquest for new territory and resources. Age of Imperialism THE SCRAMBLE FOR AFRICA 1870-1914 Conditions Prior to Imperialism of Africa  European interest in exploiting Africa was minimal.  Their economic interests & profit in Africa primarily came through coastal trade that took place during the 1500-1700s.  The slave trade became the main source of European profit.  Furthermore, disease, political instability, lack of transportation and unpredictable climate all discouraged Europeans from seeking territory. Slave Trade & the Trans-Atlantic Slave Voyages  Forced labor was not uncommon during the 13-17th Centuries. Africans and Europeans had been trading goods and people across the Mediteranea for centuries.  This all changed from 1526 to 1867, as a new system of slavery was introduced that became highly “commercialized, racialized and inherited”  By 1690, the America and West Indies saw approximately 30,000 African people shipped from Africa. A century later, that number grew to 85,000 people per year.  By 1867, approximately 12.5 million people (about twice the population of Arizona) left Africa in a slave ship. What Changed? 1. End of the Slave Trade- Left a need for trade between Europe and Africa. 2. Innovation in technology- The steam engine and iron hulled boats allowed Europe 3. Discovery of new raw materials- Explorers located vast raw materials and resources and this only spurred imperialism with Europe in the wake of the Industrial Revolution. 4. Politics- Unification of Germany and Italy left little room to expand in Europe. Germany and Italy both needed raw materials to “catch up” with Britain and France so they looked to Africa. The Scramble for Africa  The scramble started in 1870.  Although some coastal land had previously been acquired before 1870, the need for territory quickly accelerated as European countries looked t get deeper into Africa.  Within 20 years, nearly all continents were placed under imperialistic rule. Who was Involved?  Great Britain  France  Germany  Italy  Portugal  Belgium  Spain (kind) Violent Affairs  Violence broke out multiple times when European nations looked to claim the same territory.  Germ Chancellor. Otto van Bismarck. Attempted to avert the possibility of violence against the European powers.  In 1884, Bismarck organized a conference in Berlin for the European nations. The Berlin Conference (1884-85)  The conference looked to set ground rules for future annexation of African territory by European Nations.  Annexation is the forcible acquisition and assertion of legal title over one state’s territory by another state, usually following military occupation of the territory.  From a distant perspective, it looked like it would reduce tensions among European nations and avert war.  At the heart of the meeting, these European countries negotiated their claims to African territory, made it official and then mapped their regions.  Furthermore, the leaders agreed to allow free trade among imperialized territory and some homework for negotiating future European claims in Africa was established. Further Path  After the conference, european powers continued to expand their claims in Africa so that by 1900. 90% of the African territory had been claimed. A Turn towards Colonization?  Upon the imperialization of African territory, European nations and little interest in African land unless it produced economic wealth.  Therefore, European governments put little effort and expertise into these imperialized regions.  In most cases, this emat a form of indirect rule. Thus, governing the natin without sufficient settlement and government from within the mother country. Some Exceptions  There were some exemptions through in Africa as colonization was a necessary for some regions i n Africa.  Some regions where diamonds and gold were present. Government looked to protectorate the regions and establish rule and settlement in the regions.  Protectorates: A state controlled and protected by another state for defense against aggression and other law violations. Would  Some examples include South Africa, Botswana, Zimbabwe and Congo. Conclusion  Although it may appear that the Berlin Conference averted war amid the African Scramble, imperialism eventually brought the world into worldwide conflict.  With the continued desire to create an empire by European nations. World War 1 would break out which can be linked to this quest at imperialism.
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