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Q.

Why the filament of bulb  glows?

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a

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

b

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

c

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

d

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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