Current Electricity Ques 91
91. Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 volt a.c. supply line. The power drawn by the combination in each case respectively will be
[2003]
(a) 50 watt, 200 watt
(b) 50 watt, 100 watt
(c) 100 watt, 50 watt
(d) 200 watt, 150 watt
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Answer:
Correct Answer: 91.(a)
Solution:
- (a) Power $\propto \frac{1}{\text{ Resistance }}$
In series combination, total resistance increases.
Hence, power will be quartered.
In parallel combination, resistance decreases.
Hence, power will be quadrupled.
BETA
