A heat pump uses 200 J of work to output 300 J of heat into a heat reservoir at 200 K. What is the coefficient of performance for the heat pump?
A) 1.0
B) 1.5
C) 2.5
D) 2.8

Question

Quizplus · Accepted Answer

The coefficient of performance (COP) for a heat pump is given by the formula COP = Q_h / W, where Q_h is the heat delivered to the hot reservoir and W is the work input. Here, Q_h = 300 J and W = 200 J, so COP = 300 J / 200 J = 1.5.

A Heat Pump Uses 200 J of Work to Output