Question

what is the reason behind covering wires carrying electric with Rubber in some places

Answer 1

Most electrical wire is covered in a rubber or plastic coating called insulation. ... The purpose of insulation covering the metal part of an electrical wire is to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors.

Answer 2

to give insulation
copper is the wire
plastic is insulator


ex.if u hold a copper wire carrying electricity u may die
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