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Explain the application of heating effec...

Explain the application of heating effect of electric current in an electric bulb.

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In an electric bulb, there is a filment of metal such as tungsten having high melting point `(3410^(@)C)`. When an electric current is passed theough the filment, it becomes hot and emits light. The bulbs are usually filled with chemically inactive gases such as nitrogen and argon to prevent oxidation of the filament and hence prolong their life.
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