Discussion
A refrigerator removes 3 kilowatts from a cold space while consuming 1 kilowatt of compressor power. What is its coefficient of performance?
Answer: A
Correct answer: 3
\[ \mathrm{COP} = \frac{Q_C}{W} = \frac{3}{1} = 3. \] A value above one is normal and violates nothing: heat is being moved rather than generated, so three units are delivered from the cold space for one unit of work. Inverting the ratio gives the 0.33 offered, which would be a thermal efficiency and is the wrong quantity entirely.
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