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Why the filament of bulb glows?

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Current passes through the filament, it gets heated up and become red hot , hence glows.

Current passes through filament cools it down, hence it glows.

Excess of electricity passing through bulb filament, hence it glows.

None of these

answer is A.

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Detailed Solution

A filament has a lot of resistance to electricity. Therefore as a result of this, the filament heats up and become red hot and starts glowing, converting electrical energy to light energy. This is because of the Joule-effect, which means that resistances heat up when the electrical current runs through them.

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