Question

Two electric bulbs rated $P_1$ Watt and $P_2$ Watt are connected in parallel and V volt is applied to it. Total power will be

• A. $\frac{P_1{P}_2}{P_1+P_2}$ watt
• B. $\sqrt{P_1{P}_2}$watt
• C. $(P_1+P_2)$watt
• D. $\frac{P_1+P_2}{P_1{P}_2}$

Answer 1

The correct option is C $(P_1+P_2)$watt

$P_{net}=\frac{V^2}{R_{net}}$
$=\frac{\left(V^2\right)(R_1+R_2)}{R_1{R}_2}$
$=\frac{V^2}{R_1}+\frac{V^2}{R_2}$
$=P_1+P_2$