Question

An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be : (a) 100 W (b) 75 W (c) 50 W (d) 25 W​

Answer 1

Answer:

25 W

R = 2202/100 Ω = 484 Ω. This is the resistance of the bulb. When V = 110 V, power consumed = V2/R = 1102/484 = 25 W. So, 25 W power is consumed when it is operated on 110 V.

Answer 2

$R = 2202/100 Ω = 484 Ω. This is the resistance of the bulb. When V = 110 V, power consumed = V2/R = 1102/484 = 25 W. So, 25 W power is consumed when it is operated on 110 V.$