give reason why (i)tungsten is used for making filament of electric lamps; (ii) the elements of heating electrical appliaces are made up of an alloy rather than pure metal

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Solution

1-Tungsten metal is selected for making filaments of lamp bulbs because tungsten can sustain high temperatures and it has high melting point, combined with the fact that it also has high resistivity.
2-
The heating elements of electrical appliances are made of an alloy rather than pure metal because
Alloys have higher resistivity, than constituent metals.
They do not oxidize easily at high temperatures.

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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?

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