Question

why a copper electrical wire is enclosed within a plastic or rubber covering​

Answer 1

Copper wires are usually covered with rubber or plastics to prevent shocks and ensure safety. Because plastics and rubbers are insulators of electricity i.e. they cannot conduct electricity.

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Answer 2

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copper electrical wire is enclosed within a plastic or rubber covering for the protection of people because current doesn't spread in plastic or rubber since it is bad conductor of electricity.

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