A small bulb has a resistance of 2Ω when cold. It takes up a current of 0.4 A from a source of 4V and then starts glowing. Calculate (i) the resistance of the bulb when it is glowing and (ii) Elaborate on the reason for the difference in resistance?
Putting the values we get the results, Resistance = V/I. Resistance = 4/0.4. Resistance = 10 Ω
