Question

An electric bulb is rated 200 V and 50 W. When it is operated on 60 V , the power consumed will be?

Answer 1

Answer:

3.72 W

Explanation:

see the attachment .

Answer 2

Answer:

hii guys

P = V^2/R

If V = 200 V we have

50 W = 200^2/R

R = 200^2/50 Ω = 800Ω. This is the resistance of the bulb.

When V = 60 V, power consumed = V^2/R = 60^2/800 = 4.5W.

So, 60 W power is consumed when it is operated on 100 V.