# Revision cards

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• Created by: miashute1
• Created on: 02-05-18 11:23
What are the 7 main stores of energy?
magnetic, internal (thermal), chemical, kinetic, electrostatic, elastic potential, gravitational potential
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energy is transferred by one of the following four types of energy transfer:
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Calculating power
power (P) is measured in watts (W) work done (W) is measured in joules (J) time (t) is measured in seconds (s)
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Equation for calculating power
power=workdone/time
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Efficiency
A very efficient device will waste very little of its input energy. A very inefficient device will waste most of its input energy.
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Equation for Efficiency
Efficiency= Useful energy out/total energy in
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Equation for Efficiency for power
Efficiency= Useful power out/ total energy in
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## Other cards in this set

### Card 2

#### Front

energy is transferred by one of the following four types of energy transfer:

### Card 3

#### Front

Calculating power

#### Back ### Card 4

#### Front

Equation for calculating power

#### Back ### Card 5

Efficiency

#### Back 