A small bulb has a resistance of 2 ohm when cold.it takes up a current of 0.4A from a source of 4v and then starts glowing.calculate
(i) the resistance of the bulb when it is glowing;
(ii) Elaborate on the reason for the difference in resistance.
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Answer:
i) the resistance of the bulb when it is glowing is 0.1 ohm
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