The resistance of a resistor is reduced to ...

CBSE Class 10 Science 2023 Delhi Set 1

Question : 15 of 39

Marks: +1, -0

The resistance of a resistor is reduced to half of its initial value. If other parameters of the electrical circuit remain unaltered, the amount of heat produced in the resistor will become:

four times
two times
half
one forth

Solution:

H = \frac{V^2 t}{R}

, if

V

is constant, then

H

is inversely proportional to

R

. So

H

will become double if

R

becomes

\frac{1}{2}

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