Question
Physics Question on Electromagnetic induction
Two bulbs marked 60 W, 220 V and 100 W, 220 V are connected in series and the series combination is now connected across a 220 V main supply. The power dissipiated in the circuit is
A
37.5 W
B
75 W
C
80 W
D
40 W
Answer
37.5 W
Explanation
Solution
When connected in series power dissipated \hspace15mm P_S= \frac {P_1P_2}{P_1+P_2} \hspace15mm = \frac {100 \times 60}{100+60}= \frac {6000}{160}=37.5 W