The resistance of the filament of a bulb ___ when it glows.

increases

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decreases

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remains unchanged

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first increases and then decreases

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Solution

The correct option is A
increases

When current flows through a circuit, energy is dissipated in the form of heat. This heat results in the rise of temperature due to which the resistance increases. So, the temperature of the filament increases due to the current flow and this increases the resistance of the filament. Therefore, resistance of the filament of a bulb increases when it glows.

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Similar questions

What will happen to the resistance of the filament when the bulb glows?

State whether the resistance of filament of a bulb will decrease, remain unchanged or increase when it glows.

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The filament resistance of bulb is ......, to its resistance when it is not glowing.

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