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Question

An electric heater of resistance 100Ω is connected to a main supply for 20 minutes. If 2A current flows through the filament of the heater, calculate the heat energy produced in the heater.

A
4.8×105J
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B
400J
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C
626J
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D
357J
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Solution

The correct option is A 4.8×105J
Given : R=100Ω t=20×60=1200 s I=2 A
Heat energy produced H=I2Rt=22×100×1200=4.8×105 J

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