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Question

A light bulb uses energy at a rate of 25.0 Watts. If the current through light bulb is 2.00 A. What is the resistance of the bulb?

A
6.25 ohms
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B
12.5 ohms
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C
0.0800 ohms
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D
50.0 ohms
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E
100.0 ohms
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Solution

The correct option is C 6.25 ohms
Given : Power of the bulb P=25.0 Watts
Current flowing through the bulb I=2.00 A
Thus resistance of the bulb R=PI2=25.0(2.00)2=6.25 ohms

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