Q. Two bulbs of 250 V and 100 W are first connected in series and then in parallel with a supply of 250 V. Total power in each of the case will be respectively
A) 100 W, 50 W
B) 50 W, 100 W
C) 200 W, 150 W
D) 50 W, 200 W
Explanation
(d) Tow bulbs of 100 W are connected in series, the total power
$P^{'} = \frac{100 \times 100}{100 + 100} = \frac{10000}{200}$
$P^{'} = 50\ W$
When two bulbs are connected in parallel the total power
$P^{''} = 100 + 100 = 200\ W$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.