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Question

An electric bulb consumes 7.2 kJ of electrical energy in 2 minutes. What is the power of the bulb?

A
40 W
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B
50 W
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C
70 W
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D
60 W
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Solution

The correct option is D 60 W
Given:
Energy E=7.2 kJ=7.2×103 J
Time t=2 min=2×60=120 s
We know that power, P=Energyt=7.2×103120=60 W

The power of the electric bulb is 60 W.

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