Chapter 1: Energy
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Last updated 4:17 PM on 10/26/22
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46 Terms
1
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Power equation without pd(letters)
I(2)R
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Power equation(letters)
V x A
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Energy transferred equation(letters)
W x s
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power of an appliance is the energy it
transfers per second
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Total energy transferred depends on
how long the appliance is on its power
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Live wire
can give you an electric shock
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Earth wire
green and yellow, for safety and protects the wiring
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Neutral wire
blue, completes the circuit and balances it
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Live wire
brown, provides the alternating current
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mains supply is
ac
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battery supply is
dc
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In cool conditions
the thermistor resistance goes up
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In hot conditions
the thermistor resistance drops
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In darkness
LDR resistance in at its highest
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In bright light
LDR resistance falls
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LDR is a resistor that is
dependent on the intensity of light
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a thermistor is a
temperature resistor
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ohmic conductors have a
constant resistance
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resistance unit
ohm
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Charge flow equation(letters)
Q=It
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voltmeter measures
potential difference in volts
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ammeter measures
current in amps
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Pd equation
a x q
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Electric current is the flow of
electrical charge
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Doing work
Energy transferred. Done when current flows or by a force moving an object
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Kinetic energy equation
1/2 x mass x speed
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Gravitational Potential energy equation
Mass x gravitational strength x height
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Elastic Potential energy equation
1/2 x spring constant x extension
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Specific heat capacity
The amount of energy needed to raise the temperature ok 1kg of a substance by 1 Celsius
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Specific heat capacity equation
Change in thermal energy = mass x specific heat capacity x temperature change
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Conservation of energy principle
Energy can be transferred usefully, stored or dissipated but can never be created or destroyed
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Power equations(2)
Power = Energy transferred / time or Power = work done / time
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Power
Rate of doing work
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Conduction
Is the process where vibrating particles transfer energy to neighbouring particles
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Convection
Where energetic particles particles move away from hotter to cooler regions
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Efficiency equations(2)
Efficiency = useful output energy transfer / total input energy transfer or efficiency = useful power output / total power input
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Non-renewable
Will run out
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Non-renewable energy resources
Coal, gas, oil
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Renewable
Will never run out
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Renewable energy resources
Solar, wind, water waves, hydro-electricity, bio-fuels, tides, geothermal
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Bio-fuels
Energy created from plant products or animal dung
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Hydro-electric power
Requires the flooding of a valley by building a big dam
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Wave power
Turbines in the water
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Solar cells
Generate electric currents directly from sunlight
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Geothermal power
Possible in volcanic area or where hot rocks lie quite near
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Wind power
Putting wind turbines in windy areas like Scotland
Flashcards (35)