If a device has 200 W input and 150 W output, what percent of input power is lost as heat?

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Study for the Ontario Power Generation (OPG) Orange 1 Test. Ace your exam with multiple choice questions and detailed explanations. Prepare confidently!

Multiple Choice

If a device has 200 W input and 150 W output, what percent of input power is lost as heat?

Explanation:
Energy in equals useful output plus losses. Here input power is 200 W and useful output is 150 W, so the heat lost is 200 − 150 = 50 W. That loss as a fraction of the input is 50/200 = 0.25, which is 25%. So 25% of the input power is lost as heat. The remaining 75% becomes useful output (efficiency = 150/200 = 0.75).

Energy in equals useful output plus losses. Here input power is 200 W and useful output is 150 W, so the heat lost is 200 − 150 = 50 W. That loss as a fraction of the input is 50/200 = 0.25, which is 25%. So 25% of the input power is lost as heat. The remaining 75% becomes useful output (efficiency = 150/200 = 0.75).

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