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Question

# A current of 6 A flows through the heater when the electric heater is connected to 120 V supply.How much heat will it generate if the same heater is connected to 220 V supply for 10 second?

A
12.1 kJ
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B
24.2 KJ
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C
18.3 KJ
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D
30.4 KJ
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Solution

## The correct option is B 24.2 KJV1=120 V,I1=6 A and V2=220 V. Let the resistance offered by the heater be R. When first voltage supply is connected to the heater We know, V1=I1R 120=6×R R=20 Ω If we connect the same heater to the second supply voltage Substituting values in equation, V=IR 220=I×20 I=11 A Heat Generated , H=I2RT H=112×20×10=24.2 kJ

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