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A small bulb has a resistance of 2 ohm when cold. It takes up a current of 0.4a from a souce of 4 v and then starts glowing.calculate (a) the resistance of the bulb when it is glowing (b) elaborate on the reason for the difference in resistance

Posted by Govind Singh 3 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Subashini K 4 years, 8 months ago

a) R = V/I R = 4/0.4 = 10 ohms b) Resistance depends upon temperature.Initially,the temperature was low and hence the resistance was less.However,there was an increase in temperature as the bulb started glowing and hence the resistance increased.

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