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Question 5 • Physics

What is the formula for calculating the efficiency of a heat engine?

Answer

mathrm cap e f f i c i e n c y is equal to the fraction with numerator cap t sub h minus cap t sub c and denominator cap t sub h times 100

mathrm cap e f f i c i e n c y is equal to the fraction with numerator cap t sub c minus cap t sub h and denominator cap t sub h times 100

mathrm cap e f f i c i e n c y is equal to the fraction with numerator cap t sub c minus cap t sub h and denominator cap t sub c times 100

mathrm cap e f f i c i e n c y is equal to the fraction with numerator cap t sub h minus cap t sub c and denominator cap t sub c times 100

Explanation

For an ideal heat engine operating between a hot reservoir at temperature Tₕ and a cold reservoir at temperature T꜀, efficiency is 1 − T꜀/Tₕ. Written as a percentage, this is [(Tₕ − T꜀)/Tₕ] × 100. Therefore, the correct choice is A: hot temperature minus cold temperature, divided by hot temperature, times 100.

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