Question

why the rubber and plastic used to cover electric wires

Answer 1

Rubber and plastic are used to cover wires as they are Insulators.

That is, they don't conduct electricity. So that when we touch the wires, we do not get shocked

Answer 2

Rubber and plastic are good insulators

that is they donot conduct  electricity

therefore when we use them to cover electric wires, this prevents us from getting shock which can often turn fatal and saves us from danger

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