Q. Two bulbs when connected in parallel to a source take 60 W each. The total power consumed when they are connected in series with the same source is
A) 15 W
B) 30 W
C) 60 W
D) 120 W
Explanation
(b) $P_{1} = P_{2} = 60$ W; when bulbs are connected in series then total power
$P_{s} = \frac{P_{1}P_{2}}{P_{1} + P_{2}} = \frac{60 \times 60}{60 + 60} =$30 W
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.