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. Calculate

(i) the resistance of the bulb when glowing and
(ii) explain the reason for the difference in resistance.

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Answer 1

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I) When the bulb glows:

I) When the bulb glows:V = I R —- Ohm’s law R = V/I = 2/.2 =10 Ω

I) When the bulb glows:V = I R —- Ohm’s law R = V/I = 2/.2 =10 Ω(ii) Resistance of the filament of the bulb increases with increase in temperature. Hence when it glows its resistances is greater than when it is cold.

Answer 2

Explanation:

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