Question

A torch bulb has a resistance of 1 ω when cold. it draws a current of 0.2 a from a source of 2 v and glows. the resistance of the bulb when glowing is

Answer 1

I = 0.2 A
V = 2 Volts

The resistance when bulb glow = V / I
= 2 / 0.2
= 10 Ohm's

hope it helps u

Answer 2

V=IR------Ohm's law
R=V/I
R=2/.2
=10 Ohm