Discussion
Assertion (A): A heat pump using the same equipment as a refrigerator has a coefficient of performance one greater.
Reason (R): The heat rejected at the condenser is the heat absorbed plus the work supplied.
Answer: B
Both are true and the reason gives the arithmetic: dividing that sum by the work gives the cooling coefficient plus one, which is why heat pumps look so favourable against direct electric heating. A coefficient of four delivers four units of heat per unit of work.
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