Unit 06 - 01 Energy Consumption

Energy

ability to do work

What was the primary source of energy until about 1880s

Wood

What was the primary source of energy until 1920s

Coal

What are the primary energy sources for most of the world

Oil and gas

What country has the largest coal reserves

U.S.

What country has the largest natural gas reserves

Russian Federation

What country has the largest oil reserves

Venezuela

Most of the worlds current energy needs are fulfilled using ______

fossil fuels

Force

a push or pull that changes the motion of an object

Measured: Newtons (N)

F = mass (kg) x acceleration (m/s2)

Work

a force applied over a distance

Measured: Joules (J)

W = force (N) x distance (m)

Power

rate of doing work (energy used over time)

Measured: Watts (W)

P = work/time (J/s)

Energy Equation

Power (W) x time (s)

What does 1 kW equal in watts

1 kW = 1000 W

What is 1 W in kW

1 W = 0.001 kW

What is 1 kWh in Wh

1 kWh = 1000 Wh, 1 Wh = 0.001 MW

What is 1 MW in KW

1 MW = 1000 kW

What is 1 MWh in kWh

1 MWh = 1000 kWh, 1 kWh = 0.001 MWh

Calorie

amount of heat energy required to raise the temp of 1g of water 1C

What is 1 calorie in joules

1 calorie = 4.186 joules

What is "1 Calorie"

1 Calorie = kilocalorie

Are calorie and Calorie different?

YES

British Thermal Unit (Btu)

amount of heat energy required to raise the temp of 1 lb of water 1 F

Btu - calorie - Joules

1 Btu = 252 calories = 1055 J

What is the 1st Law of Thermodynamics

Energy can be neither created nor destroyed; changed from one form to another

What is the 2nd Law of Thermodynamics

The entropy (disorder) of a system increases. The quality of the energy degrades over time

Input

all of the components (matter and or energy) entering a system

Throughput

the flow of all components within a system

Output

all components leaving a system

What is the efficiency equation

% Efficiency = (output/input) x 100

How is missing energy lost?

Missing energy is lost in the form of heat

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