Question

an electric bulb is rated 220 V and 100 Watts. when it is operated on 110 V, the power consumed will be? Calculate using only this formula P=VI​

Answer 1

Explanation:

Given V = 220V, P = 100W

P = V^2/R

R = 220^2/100

R = 440 ohm

Power consumed at 110V = V^2/R

P = 110^2/440

P = 27.5 W