Insulator
An electrical insulator is a material which will not carry electric current. Plastics, rubber, glass, and dry air are examples. A wire is a conductor which will carry current, wrapped in an insulator to prevent it touching other wires or earth/frame. Wire insulation must be tough enough for its purpose and environment. The terms conductor and insulator may also be used to show a materials ability to carry or block heat, that is, thermal conductors/insulators.
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