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A potential difference of 100 V is appli...

A potential difference of 100 V is applied across an electric bulb marked 40 W. 200 V. The power consumed in the bulb is . …………….. .

A

100W

B

40W

C

20W

D

10W

Text Solution

Verified by Experts

The correct Answer is:
D
`P = V^2/R`
`:.`Resistance of the filament of the bulb,
`R = V^2/P = ((200)^2)/(40) = 1000Omega`
Now, power consumed in the bulb,
`P = V^2/R = ((100)^2)/1000 = 10 W`
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