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

Question

(a) 100 W (b) 75 W (c) 50 W (d) 25 W

Answer 1

The resistance of the bulb remains constant if the supply voltage is reduced to 110 V. If the bulb is operated on 110 V, then the energy consumed by it is given by the expression for power

Hence, the option (d) is correct.