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An electric bulb is rated 220 V and 100 ...

An electric bulb is rated 220 V and 100 W. when it is operated on 110 V, the power consumed will be

A

100W

B

75W

C

50W

D

25W

Text Solution

Verified by Experts

The correct Answer is:
D
`P=(V^(2))/(R )`
`rArr R=(V^(2))/(R )=(220xx220)/(100)=484Omega`
`P=(V^(2))/(R )=(110xx110)/(484)=25W`
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