Question

Name the materials used for making
(A)wires used for electrical connections.
(B)filament of an electric bulb
(C)resistor
(D)Heating element of a room heater.

Answer 1

Hint : All the things such as wires, filaments, room heater are used to conduct heat or electricity. That is why the materials used to make all these components should be good conductors of heat and electricity. Metals are the good conductor of heat and electricity.

Complete Step By Step Answer:
Copper is preferred to make connecting wires used for electrical connection, due to its low cost as compared to silver and as it has low resistivity and high conductivity.
A wire made up of tungsten is used to make filament of an electric bulb. As it has a high melting point and resistivity.
Resistors are made up of a mixture of finely powdered carbon and insulating material such as ceramic.
A nichrome wire is used in the heating element of a room heater, it has high resistivity and it increases as the temperature increases.

Note :
To any component to function properly, selection of material plays an important role. Selection of material is based upon the chemical and physical properties of material such as resistivity, conductivity, melting point and the cost of the material.