If a motor produces 746 watts of mechanical power from an input of 1500 watts, what is its efficiency?

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Multiple Choice

If a motor produces 746 watts of mechanical power from an input of 1500 watts, what is its efficiency?

Explanation:
Efficiency is the ratio of useful mechanical power produced to the power supplied, expressed as a percentage. It’s found by dividing the output power by the input power and multiplying by 100. In this case, 746 W of output from 1500 W of input gives: (746 / 1500) × 100 ≈ 49.7%. That result makes sense because some of the input energy is always lost to inefficiencies like heat and friction. An efficiency of 74.6% would require a larger output for the same input, while 100% would imply no losses, which isn’t the case here.

Efficiency is the ratio of useful mechanical power produced to the power supplied, expressed as a percentage. It’s found by dividing the output power by the input power and multiplying by 100. In this case, 746 W of output from 1500 W of input gives: (746 / 1500) × 100 ≈ 49.7%. That result makes sense because some of the input energy is always lost to inefficiencies like heat and friction. An efficiency of 74.6% would require a larger output for the same input, while 100% would imply no losses, which isn’t the case here.

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