Question

an electric bulb is rated 220V and 100W. when it is operated on 110V the power consumed will be? pls answer fast

Answer 1

hey friend!!!!

=> P = V²/R

If V = 220 V

we have

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.

hope it will help you

Answer 2

given,V1=220V
P=109W
since,P=V^2/R
So,R=V^2/P=(220)^2/100=48400/100=484ohm
now,P2=V2^2/R=(110)^2/484=12100/484=25W
thank u, Hope it helps!