Question

An electric bulb is rated 220V and 100W.What will be the power consumed when it is operated at 110V?​

Answer 1

Given:

V=220V

P=100W

Since, P=V×I

Therefore,

100=220×I

I=100/220

I=5/11

I=0.45A

Now,

V=110V

I=5/11A

Therefore,

P=110×5/11

P=50 W

Therefore required power is 50 W.

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