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A light bulb is rated 100W for a 220V su...

A light bulb is rated 100W for a 220V supply. The resistance of the bulb and the peak voltage of the source respectively are

A

242`Omega`and 311 V

B

484 `Omega` and 311 V

C

484 `Omega` and 440 V

D

242 `Omega` and 440 V

Text Solution

Verified by Experts

The correct Answer is:
B
`R = (V^(2))/(P) = ((220)^(2))/(100) = 484 Omega`
`V_("peak") = sqrt(2) V_(rms) = sqrt(2) xx 220 = 311` V
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