What are insulators?
An insulator, also called a dielectric, is a material that resists the flow of electric current. An insulating material has atoms with tightly bonded valence electrons. These materials are used in parts of electrical equipment, also called insulators or insulation, intended to support or separate electrical conductors without passing current through themselves. The term is often used more specifically to refer to insulating supports that attach electric power transmission wires to utility poles or pylons.
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