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Electric Power

Question 18 b...

Question

Question 18 (b)
Explain:
(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?

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Solution

The conductors of electric heating devices such as bread toasters and electric irons are made of alloy because the resistivity of an alloy is more than that of metals which produces a large amount of heat.

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Q. Question 4
Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?

Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?

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?

(c) Why is the series arrangement not used for domestic circuits?

(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?

Q. Question 4
Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?

Q. Why are the coils of electric toasters made of an alloy rather than a pure metal?

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