Question

100W electric bulb working at 110V. How much will be the power of 220V

Answer 1

Answer:

as, P = V^2/R

where, P = power dissipated

V = potential difference

R = resistance

Here, P = 100 W

V = 110 V

Now, R = V^2/P

or, R = 110×110/100 = 121 ohm

Now, Required power when V = 220 V

P = V^2/R = 220×220/11×11

or, P = 400 W

Hence, Required power is 400 W...

Answer 2

Answer:

as 100w electric bulb working at 110 v

then, for

220 v the power became 400 w .