Question

explain reason for the following :

(i)tungsten is used almost exclusively for filament of electric lamps.

(ii)the series arrangement is not used for domestic circuit.

(iii)cooper and aluminium wires are usually employed for electricity transmission.

Answer 1

(i) Tungsten a very useful metal is used as a filament in traditional bulbs because of its high melting point. Moreover its a very good conductor of electricity.

(ii) Series arrangements are not used for domestic purposes because if one of the resistor does not function, the whole circuit becomes useless. Moreover if we need to use just one appliance then we are not able to do so if its in series.

(iii) Copper and aluminium are very good conductors of electricity with a very high melting point. So they are normally employed for electricity transmission.

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Answer 2

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1) The melting point and resistivity of tungsten are very high. It does not burn very esay at a high temperature. The electric lamps glow at very high temperatures. Hence, tungsten is mainly used as heating element of electric bulbs.

2) series arrangement is not used in domestic circuits. Because

◾ There is voltage division in series circuits. Each component of a series circuit receives a small voltage for a large supply voltage. As a result, the amount of current decreases and the device becomes hot.

3)

◾ Copper and aluminium wires have low resistivity.

◾ They are good conductors of electricity. Hence, they are usually employed for electricity transmission.

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