Question

A bulb rated 220v and 200w is connected with 110v Then what will be the power it consumes?​

Answer 1

Answer: given :

V = 220V

And P= 200W

So we have P = V^2/R

200= 220x220/R

R= 220x220/200

R = 242ohm

P= V^2 /R

V= 110v

So we get P= 110x110/242

P= 50W

Hence power consumed is 50 W.