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Ratio of useful work done to energy supplied
As a percentage
useful energy outputtotal energy input\frac{\text{useful energy output}}{\text{total energy input}}total energy inputuseful energy output
useful power outputtotal power input\frac{\text{useful power output}}{\text{total power input}}total power inputuseful power output
Reducing waste output
Recycling waste output
Lubrication, thermal insulation
Absorbing thermal waste and recycling as input energy
20%
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