A machine uses 600 J input energy to produce 150 J useful work. What is efficiency?

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Multiple Choice

A machine uses 600 J input energy to produce 150 J useful work. What is efficiency?

Explanation:
Efficiency is the fraction of input energy that becomes useful work, expressed as a percent. Here, useful work is 150 J out of 600 J input. The ratio is 150/600 = 0.25, and converting to a percentage gives 25%. So only a quarter of the energy is converted into useful work, with the rest lost to inefficiencies like heat and friction.

Efficiency is the fraction of input energy that becomes useful work, expressed as a percent. Here, useful work is 150 J out of 600 J input. The ratio is 150/600 = 0.25, and converting to a percentage gives 25%. So only a quarter of the energy is converted into useful work, with the rest lost to inefficiencies like heat and friction.

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