A refrigerator extracts 25 kJ from a cold reservoir and rejects 35 kJ to a hot reservoir.What is the coefficient of performance of this refrigerator?

Question

Quizplus · Accepted Answer

The coefficient of performance of a refrigerator is given by the ratio of the heat extracted from the cold reservoir to the work done. In this case, the heat extracted from the cold reservoir is 25 kJ and the work done is 35 kJ - 25 kJ = 10 kJ. Therefore, the coefficient of performance is 25 kJ / 10 kJ = 2.5.

A Refrigerator Extracts 25 KJ from a Cold Reservoir and Rejects