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Gravitational potential energy stored in the water reserved in a dam becomes useful to generate electricity.
Bad- falling off a building
Efficiency = ( useful energy output / total energy input ) x 100
if you mean in terms of energy then it refers to a device that transfers more useful energy than it wastes if you mean in terms of energy then it refers to a device that transfers more useful energy than it wastes
The net output of useful work is (weight) times (gain in height) = 2,000 newton-meters = 2,000 joules.The rate of doing the work, and adding to his gravitational potential energy,is (2,000/40) = 50 joules per second = 50 watts.He certainly had to generate and expend more power than that in order to accomplish the climb.But most of the energy he expended went into heating his muscles and the rest of his body.50 watts is the power that went into the useful part of hoisting his weight to a position of fivemeters higher than where he started.