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  4. A resistor develops 500 J of thermal energy in 20 s when a current of 1.5 A is passed through it. If the current is increased from 1.5 A to 3 A, what will be the energy developed in 20 s.

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Q. A resistor develops $500\,J$ of thermal energy in 20 s when a current of $1.5\,A$ is passed through it. If the current is increased from $1.5\,A$ to $3\,A$, what will be the energy developed in $20 \,s$.

JEE MainJEE Main 2021Current Electricity

Solution:

$500=(1.5)^{2} \times R \times 20$
$E =(3)^{2} \times R \times 20$
$E =2000 \,J$