Question

Power dissipated in a resistor is to resistance when current through it is constant, and to resistance when voltage across it is constant.

• A. proportional
• B. inversely proportional
• C. equal
• D. unsusceptible

Answer 1

Answer: (A), (B)

inversely proportional

Power = $i^{2}R$ or $\frac{V^2}{R}$.
If $V$ is constant, then from $i^{2}R$, we can say power is proportional to $R$. However, if $i$ is constant, from $\frac{V^2}{R}$, we can say power is inversely proportional to $R$.