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Good insulators

Good insulators are that kind of materials which keep things warm for longer, or little flow of electricity, it helps to stop heat or electricity from escaping.

Good insulator

Not necessarily. Solid plastics or solid glass or ceramic have high dielectric strength but not good thermal insulation but good insulators for electricity. Different materials have different levels of insulative properties. Some are more insulative (nonconductive) than others.

In a conductor, electric current can flow freely, in an 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.

Most solid materials are classified as 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.

Glass, porcelain and silicone rubber are good insulators, so they are used on electrical field, and play an important role in power system.

 

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