Current Electricity Ques 88
88. When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be
(a) 20 watt
(b) 60 watt
(c) 180 watt
(d) 10 watt
[2004]
Show Answer
Answer:
Correct Answer: 88.(a)
Solution:
- (a) $\frac{1}{P _{\text{eq }}}=\frac{1}{P_1}+\frac{1}{P_2}+\frac{1}{P_3}$ or $\frac{1}{P _{\text{eq }}}=\frac{3}{60}$ $\Rightarrow P _{\text{eq }}=20$ watt.
BETA
