Question

Explain the following,

(a) Why is the tungsten used almost exclusively for filament of electric

lamps?

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

(c) How does the resistance of a wire vary with its area of cross section?​

Answer 1

Answer:

1. The melting point and of Tungsten is an alloy which has very high melting point and very high resistivity so does not burn easily at a high temperature. ... (e) Copper and aluminum are good conductors of electricity also they have low resistivity. So they are usually used for electricity transmission.
2. a series connection, if one electrical appliance stops working due to some defect, then all other appliances would stop working. ... In a series connection, all the appliances do not get the same voltage as the voltage gets divided in series combination.
3. It is inversely proportional to the area of cross section of the wire. The more the area of cross section of the wire,the less is the resistance and the less the area,the more is the resistance.

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