Explanation:
A material that allows electric current to pass through it is called a conductor of electricity like the key and the safety pin [Figs. (b) and (d)]. A material that does not allow electric current to pass through it is called an insulator of electricity like the rubber band and the plastic pen [Figs.(a) and (c)].
All metals are conductors of electricity while some are better conductors than others. A few non-metals like graphite (pencil lead is made of graphite) are also conductors of electricity.
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