Question 18) 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-toast

Question 18) 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-toast- Hosting Precise

Posted on 4th Sep 2021 04:46:01 in

Question 18) 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?

Ans :

Tungsten is used almost exclusively for filament of electric lamps as they have very high melting point and high resistivity.
They don’t burn easily at high temperatures.
The conductors of electric heating devices, such as bread- toasters and electric irons, made of an alloy rather than a pure metal because resistivity of the alloy is more than the resistivity of the metals which produces large amount of heat.
There is voltage division in series circuit as each component receives a small voltage so the amount of current decreases and the device becomes hot and does not work properly.
Resistance of wire is inversely proportional to it area of cross-section.

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