Question

Ten $60W,220V$ bulbs are connected in series to $220V$ supply. Power consumed in the circuit is

• A. 6 W
• B. 12 W
• C. 180 W
• D. 600 W

Answer 1

Answer: (A)

$P=\frac{V^2}{R}$
$R=\frac{V^2}{P}=\frac{(220{)}^2}{60}$
$P_{\text{Total }}=\frac{V^2}{R_{eq}}$
$=\frac{(220{)}^2}{10(220{)}^2}\cdot 60=6W$