Question

(c) An electric bulb is rated 220v and 100W. When it is operated on 110V, what will be the
power consumed?​

Answer 1

Answer:

As per the equation P = V2/R

If V = 220 V

100 W = 2202/R

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.