Question

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?

Answer 1

hope it may help you dear

Answer 2

reason as it's glowing so it is taking current which is generating heat