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Question

# When the current in a conductor is doubled, keeping its resistance constant, the electrical power dissipated through the conductor will be _________.

A
doubled
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B
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C
tripled
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D
the same
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Solution

## The correct option is B quadrupledPower dissipated in a conductor is: P=VI=I2R Since conductor is not changed, resistance (R) is constant. ⟹P∝I2 Ratio of power will be: P2P1=(2I)2I2 P2P1=4 Therefore, if the current is doubled, the power dissipated through the conductor becomes 4 times of the original.

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