Question

Electric bulb is rated 220 volt and100w .When it is operated on 110v the power consumed will be

Answer 1

Answer: 50 watt

Explanation: simply as for 220 power is 100 so for 110 volt ( the half of given voltage ) the power consume is also half..so power is 50 watt..

Other way :-

As P= VI

I = P/V = 100/220 = 5/11 amp

Now forV = 110 v we have

P = vi= 110 * 5/11 = 50 watt