Electrical conductivity of a material

​Different materials have different abilities to pass electricity. For example metals have good ability to pass electricity however plastic or wood are not.

Ability to pass electricity is measured in ohms. The lower ohms value, the better material passes electricity however plastic.

Since metals have good ability to pass electricity than wires have metal core to pass it, however plastic doesn’t pass electricity well, therefore wires have plastic outer layers to prevent accidental leakage of electricity.

It is important to have undamaged protective layer of a wire, damaged protective layer means that voltage can be transmitted.

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