If an example power machine outputs 200 J of useful work from 500 J input, its efficiency is expressed as.

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Multiple Choice

If an example power machine outputs 200 J of useful work from 500 J input, its efficiency is expressed as.

Explanation:
Efficiency is the fraction of input energy that becomes useful work. It’s found by dividing the useful output energy by the total input energy. Here, 200 J of useful work comes from 500 J of input, so the efficiency is 200/500 = 0.4, or 40%. This shows that 60% of the input energy is lost to things like heat and friction. Since efficiency cannot exceed 1, 0.4 is the proper expression for this scenario.

Efficiency is the fraction of input energy that becomes useful work. It’s found by dividing the useful output energy by the total input energy. Here, 200 J of useful work comes from 500 J of input, so the efficiency is 200/500 = 0.4, or 40%. This shows that 60% of the input energy is lost to things like heat and friction. Since efficiency cannot exceed 1, 0.4 is the proper expression for this scenario.

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