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11 cards from this deck
Ratio of useful work done to energy supplied
As a percentage
useful energy outputtotal energy input\frac{useful\ energy\ output}{total\ energy\ input}total energy inputuseful energy output
useful power outputtotal power input\frac{useful\ power\ output}{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
100 joules
20 joules
20% efficient
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