Question

an electric bulb mark 40 watt-220 volt is used in a circuit of supply voltage and 100 v now its power is A 100w B 40w C 20w D 10w​

Answer 1

Explanation:

p=V× I

40=220×I

I=40/220

=2/11 A

Now,

V=100V

I=2/11 A

P=V×I=100×2/11=200/11=20W( approx.)