Question:
A resistor dissipates $192 \mathrm{~J}$ of energy in $1 \mathrm{~s}$ when a current of $4 \mathrm{~A}$ is passed through it. Now, when the current is doubled, the amount of thermal energy dissipated in $5 \mathrm{~s}$ in
Solution:
$\mathrm{E}=i^{2} \mathrm{Rt}$
$192=16(\mathrm{R})(1)$
$\mathrm{R}=12 \Omega$
$\mathrm{E}^{1}=(8)^{2}(12)(5)$
$=3840 \mathrm{~J}$