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Question

A current of 0.5A flows through a resistance of 10Ω for 12 hour. Find the amount of electrical energy consumed by resistance.

A
450 J
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B
4500 J
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C
45 J
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D
45000 J
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Solution

The correct option is B 4500 J
Given:
Current flowing through the resistor I=0.5 A
Resistance R=10Ω
Time for which current flows, t=12 hr=30min=30×60 s=1800 s
By Joule's law of heating, energy consumed by the resistance,
E=I2RT=(0.5)2×10×1800
=4500 J

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