Explain :
Why is the tungsten used almost exclusively for filament of electric lamps?

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Solution

Tungsten is used for filaments in electric lamp because of,

High electrical resistivity: Electric lamp works on the principle of heating effect of current. So, high heat generation is required for effective operation. Since the heat generated is proportional to resistance, a high resistance is desired. This property is provided by tungsten.

High melting point: The temperature inside an incandescent bulb usually reaches extremely high temperatures. Tungsten has a very high melting point and does not melt.

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Similar questions

Explain the following.

(a) Why is the tungsten used almost exclusively for filament of electric lamps?

(b) Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?

(d) How does the resistance of a wire vary with its area of cross section?

(e) Why are copper and aluminium wires usually employed for electricity transmission?

Explain why, tungsten is used for making the filaments of electric bulbs.

Tungsten do not oxidize at high temperature. Can it be the reason for tungsten used almost exclusively for filament of electric lamps?

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