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Q.

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 ac supply line. The power drawn by the combination in each case respectively will be :

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a

50 watt, 100 watt

b

100 watt, 50 watt

c

200 watt, 150 watt

d

50 watt, 200 watt

answer is D.

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Detailed Solution

If rated voltage = supply voltage then use 1P=1P1+1P2=1100+1100=150⇒P=50 W (series connection) and P = P1 + P2 = 100+100 = 200 W (parallel connection)

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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 ac supply line. The power drawn by the combination in each case respectively will be :