Question

Two bulbs of 220 V and 100 W are first connected in series and then in parallel with a supply of 220 V. Total power in both the cases will be ______ .(A) 50 W, 100 W
(B) 100 W, 50 W(C) 200 W, 150 W
(D) 50 W, 200 W

Answer 1

Power in Series = P1 + P2

=> 100 + 100

=> 200 W

Power in Parallel = 1/p1 + 1/p2

=> 1/P = 1/100 + /100

=> 1/P = 2/100

=> 1/P = 1/50

=> P = 50W

Therefore, D is correct