Question

The equation Power $=\frac{V^2}{R}$ is valid only when the potential across the resistors are constant.

• A. True
• B. False

Answer 1

The correct option is A True

We know $P=VI$
$I=\frac{V}{R}\left(Oh{m}^{\prime }sLaw\right)$
Substituting for I,
$P=V\frac{V}{R}$
Thus, $P=\frac{V^2}{R}$