First slide

Electrical power

Question

Resistance of conductor is doubled keeping potential difference across it constant. The rate of generation of heat will

Easy

A

become one-fourth
B

be halved
C

be doubled
D

become four times

Solution

$H = Vit = \frac{V^{2}}{R} \times t$
or rate of heat generation $= (\frac{H}{t})$
Keeping V constant, when .R is doubled $(\frac{H}{t})$ is halved

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