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Superconductors

Give reason -...

Question

Give reason -
For electric power transmission, copper or aluminium wire is used.

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Solution

1. Copper and aluminium are good conductors of electricity.

2. Copper, and aluminium have very low resistivity. Hence, when an electric current flows through a wire of copper or aluminium, heat produced is comparatively low. Therefore, for electric power transmission, copper or aluminium wire is used.

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Q. Give Scientific reasons.
a. Tungsten metal is used to make a solenoid type coil in an electric bulb.
b. In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster etc, an alloy such as Nichrome is used, not pure metals.
c. For electric power transmission, copper or aluminium wire is used.
d. In practice the unit kWh is used for the measurement of electrical energy, rather than joule.

Q. Explain the following:
(a) Why is tungsten used almost exclusively for filament of electric lamps?
(b) Why are copper and aluminium wires usually used for electricity transmission?
(c)Why is nichrome alloy used for making elements of electric irons?

Q. Give scientific reason:
For electric power transmission,copper or aluminium wire is used.

Q. Give reason: For electric power transmission, copper or aluminium wire is used. [2 Marks]

6. Why copper or aluminium wires are used in electricity transmission?

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