Electric conductors and insulators are absolutely necessary for life.
In an electric conductor, electric current can flow freely, in an electric insulator, such as polymer insulator, it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them. "Electric Conductors" implies that the outer electrons of the atoms are loosely bound and free to move through the material. Most atoms hold on to their electrons tightly and are insulators. In copper, the valence electrons are essentially free and strongly repel each other. Any external influence which moves one of them will cause a repulsion of other electrons which propagates, "domino fashion" through the conductor.
Simply stated, most metals are good electric conductors, most nonmetals are not. Metals are also generally good heat electric conductors while nonmetals are not.
Most solid materials are classified as insulators, for example composite suspension insulator, because they offer very large resistance to the flow of electric current. Metals are classified as conductors because their outer electrons are not tightly bound, but in most materials even the outermost electrons are so tightly bound that there is essentially zero electron flow through them with ordinary voltages. Some materials are particularly good insulators and can be characterized by their high resistivity: porcelain, glass and composite. It is as we known porcelain insulators, glass insulators and composite insulators.
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