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A level Physics 3.3

Definitions

TermDefinition
Work done (W) work done = force x distance moved in the direction of force
Conservation of Energy The total energy of a closed system remains constant as energy cannot be created or destroyed (it can only be transferred into other forms)
Power (P) power = work done/ time
Efficiency The percentage of energy that is transferred usefully by a device. It is always less than 100% due to heat losses.
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