Question 18 (a)
Explain:
(a) Why is the tungsten used almost exclusively for filament of electric lamps?

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Solution

Tungsten is an alloy which has a very high melting point and very high resistivity so it does not burn or melt easily at a high temperature.

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Q. Explain the following:
(a) Why is tungsten used almost exclusively for filament of electric lamps?
(b) Why are copper and aluminium wires usually used for electricity transmission?
(c)Why is nichrome alloy used for making elements of electric irons?

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

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?

Tungsten is used almost exclusively for filament of incandescent lamps because tungsten has a high melting point ( $3380^{\circ}$ C) and becomes incandescent (i.e., emits light at a high temperature) at 2400 K.

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

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Alloys

Standard IX Chemistry

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Question 18 (a) Explain: (a) Why is the tungsten used almost exclusively for filament of electric lamps?

Tungsten is an alloy which has a very high melting point and very high resistivity so it does not burn or melt easily at a high temperature.

Question 18 (a)
Explain:
(a) Why is the tungsten used almost exclusively for filament of electric lamps?