The atoms of copper contain electrons and the atoms of rubber also contain electrons. Then why does copper conduct electricity but rubber does not conduct electricity?

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Solution

Any substance can conduct electricity only if it has free electrons.

It is true that copper and rubber, both have electrons but copper has free electrons, which are responsible for flow of current and hence, conduct electricity.

Rubber, on the other hand, does not have free electrons and cannot conduct electricity and are called insulators.

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