Question

A 200w ,230v lamp is connected across 115v supply. The lamp will draw power?​

Answer 1

Answer:

First we find the resistance of the lamp that is given by formula p=V*V/R

R=230*230/200=264.5 ohm

now current flow through the lamp when connected to the supply 115 V that is

I=V/R

I=115/264.5=0.435

now power draw by the lamp given by

p=V*I=115*0.435=50.025

so it is slightly more than 50 W.