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}= {\V}^2 t \/ {\R}

, if

{\V}

is constant, then

{\H}

is inversely proportional to

{\R}

. So

{\H}

will become double if

R

becomes

1 \/ 2

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