During the operation of the heat engine for a certain time, the working fluid received from heating the amount of heat equal

univerkov | December 16, 2020 | education

During the operation of the heat engine for a certain time, the working fluid received from heating the amount of heat equal to 2.0 MJ, and gave the refrigerator 1.5 MJ. Calculate the efficiency of the machine.

We know that efficiency is efficiency = (Q1-Q2) / Q1 * 100% (if the answer should be in percent)
we have Q1, this is 2 MJ, and we have Q2, which is 1.5 MJ, substitute and get (2 – 1.5) / 2 * 100% = 0.5 / 2 * 100% = 25%

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