Question

A 200 W and a 100 W bulbs, both meant for operation at 220 V, are connected in series, to a 220
V supply. The power consumed by them will be

• A. 33 W
• B. 66 W
• C. 100 W
• D. 300 W

Answer 1

The correct option is B 66 W

Power consumed by a resistance is given by,$P=V^2/R$.
This imply $R=V^2/P$.
$R_{eq}={220}^2/100+{220}^2/200$
Net power consumed will be $P=V^2/R_{eq}$
$P=200/3$ w