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Q.

There are two electric bulbs of 40 W and 100 W. Which one will be brighter when connected in series and when in parallel?

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a

40 W in series and 100 W in parallel

b

100 W in series and 40 W in parallel

c

40 W both in series and parallel will be uniform

d

100 W both in series and parallel will be uniform

answer is A.

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Detailed Solution

R1R2 = P2P1 =  10040 =  52.  Resistance of 4o w bulb is 52 times than 100 W. In series, P=i2R and in parallel, P=V2R So 40 W in series and 100 W in parallel will glow brighter.
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