First slide

Refrigerator

Question

An electrical refrigerator abstracts 2000 calories from ice trays. The coefficient of performance is 4. Then the work done by motor in calories is

Easy

A

8000
B

4
C

2000
D

500

Solution

$\begin{array}{l} Î² = \frac{Q_{1}}{Q_{1} â Q_{2}} = \frac{Q_{1}}{W} \\ W = \frac{Q_{1}}{Î²} = \frac{2000}{4} = 500 calories \end{array}$

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