Question

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

Answer 1

p = V2/R

:- R = V2/p

:- R = (220 * 220)/100

:- R = 484 ohm

ACCORDING TO QUESTION:-

P = V2/R

P = (110 * 110)/484

P = 25 watt .... Answer