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Q.

If a heater coli rated 1kW, 220V is connected in series with an electric bulb of 100W, 220V and are supplied 200V, power consumed by the bulb in this circuit is 

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a

68.4 W

b

45.8 W

c

10.6 W

d

29.5 W

answer is A.

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Detailed Solution

P=V2R⇒R=V2P

R1=22021000Ω, R2=2202100Ω

Rseries=R1+R2=2202×111000Ω

Current: i= VRseries=200×10002202×11

Power consumed by bulb =i2R2≃68.4 W

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