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Q.

A 25 W-120 V bulb and 100 W – 120 V bulb are connected in series across  120 V line. Which bulb will be brighter ?

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a

25 W – 120 V

b

100 W- 120 V

c

Both will have same incandescence

d

neither will give any light

answer is A.

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Detailed Solution

R1=120225  and  R2=1202100 ∴R1>R2 Also, P1=i2R1  and  P2=i2R2    (bulbs in series means same current) ∴ P1 > P2 The bulb which consumes more power glows brighter
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A 25 W-120 V bulb and 100 W – 120 V bulb are connected in series across  120 V line. Which bulb will be brighter ?