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An electric bulb is rated 220 volt - 100...

An electric bulb is rated 220 volt - 100 watt. The power consumed by it when operated on 110 volt will be

A

50 watt

B

75 watt

C

90 watt

D

25 watt

Text Solution

Verified by Experts

The correct Answer is:
D
`R = (220)^(2)/100 = 484 Omega`
`I = 110/484 Omega, P = i^(2)R = ((110)^(2) xx 484)/(484)^(2)`
`= (110 xx 110)/484 = 25` watt
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