When three identical bulbs of $60 \;W, 200\;V$ rating are connected in series to a $200 \;V$ supply, the power drawn by them will be ....... $Watt$
A$180$
B$60$
C$20$
D$\frac{{20}}{3}$
AIPMT 2004, Easy
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C$20$
c In series $P' = \frac{P}{n} = \frac{{60}}{3} = 20\,watts$
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