The materials of electric heating devices are usually made of:

(A) Argon

(B) Bronze

(C) Nichrome

(D) Tungsten

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Solution

Nichrome

because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time. Material beneath this layer will not oxidize, preventing the wire from breaking or burning out.

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Similar questions

The elements of electrical heating devices are usually made of:
(a) tungsten (b) bronze (c) nichrome (d) argon

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?

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

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