Question

Calculate the current and resistance of a 100 W, 200V electric bulb.

Answer 1

Here, Power of the bulb = 100W
Voltage=200V
so, Current I = P/V=100/200=1/2 = 0.5 A
So, resistance=V/I=200/0.5=400 ohm

Answer 2

Power = V i
i = Power / V
i = 100 / 200
i = 0.5 A

V = iR
R = V/i
R = 200 / 0.5
R = 400 Ω

Current: 0.5 A
Resistance: 400 Ω