Exam-style question
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In a reversed heat engine, what is the coefficient of performance (COP)?.
- A.The ratio of heat removed from the cold reservoir to work input
- B.The ratio of work output to heat input
- C.The efficiency of the engine
- D.The total energy output of the engine
Model answer
What a good answer should say
- The ratio of heat removed from the cold reservoir to work input
Explanation
Why this works
The coefficient of performance (COP) for a reversed heat engine is defined as the ratio of the heat extracted from the cold reservoir to the work input required to transfer that heat.
Common mistake
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