Question

20.
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?
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Answer 1

Answer:

1.due to the higher resistivity of tungsten which produce more heat as compared to metal

2.alloys have higher melting point and resistivity than pure metal

3.because in series arrangement all devices connected in series if one of them is damaged the other can't be on

and if we switch off any one of them all will off automatically

4. resistance is Inversely proportional to area of cross section of wire

5 copper and aluminium wires are used as transmission cables because they are light metal so these wires are light in weight compared to other wires

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