The material which allows the electric current to pass
through it is known as a conductor. The best conductor is
which offers least resistance to the flow of electric
current through it. The conductors have a number of free
electrons which get excited on being heated or when the
electric current passes through it.
Silver is the best conductor of electricity. Copper and
aluminum are also considered good conductors of electricity
so they are used to make electric wires.
The resistance of conductors’ increases as the temperature
rises so the conductors offer more resistance to electric
current at higher temperature.
material which offers resistance to the flow of electric
current through it is known as an insulator. In insulators
the electron are closely bound to the nucleus so there is no
free electron available for excitation.
Examples of such insulators are graphite, glass and mica in
which the electrons are very closely bounded to the nucleus.
Insulators lose their insulating power at high