Question

Why does an eletric bulb glow when acurrent passes through it?

Answer 1

Here is your answer ⤵⤵⤵⤵⤵⤵

The filament in the bulb has resistance. The current flowingthrough the resistance of bulb causes the filament to dissipate energy in the form of heat and light. The filament is actually glowing white-hot because of the energy it is dissipating, thus giving off light.

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Answer 2

The bulb glows when the current passed through it due to the heating effect of electric current.

Explanation:

• An electric bulb contains a wire called filament which is usually made up of tungsten.
• The filament has high electric resistance say $R$.
• When current say $I$ is passed through it, the electrical energy gets converted into heat energy ($\[Energy = IR\]$ ) due to resistance and this makes the filament glow.
• This is also called the heating effect of electric current.
• Therefore, when current is passed through the bulb, due to its electrical resistance, electrical energy gets converted into heat energy which makes the bulb glow.

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