Question 18 (d)
Explain:
(d) How does the resistance of a wire vary with its area of cross-section?

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Solution

Resistance (R) of a wire is inversely proportional to its area of the cross-section (A), i.e., when the area of cross section increases the resistance decreases or vice versa.

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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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