Question

An electric bulb is marked 220V,100W.when it is connect across 110V,it's power is

Answer 1

I think this is the answer.

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Answer 2

P=100W

V=220V

P=V2/R

P=220*220/R

100=48400/R

R=484 ohm

When v=110v

then P=v2/R

p=110*110/484

P=5*5

P=25W

Hope it help you

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