Insulator

Insulators

Insulators are made non-metals, that have very few or no “free electrons” floating in their basic atom structure because the electrons in the outer valence shell are strongly attracted by the positively charged inner nucleus.

Insulators also have very high resistances, in the range of millions of ohms per meter. Examples of good insulators are marble, fused quartz, PVC plastics, rubber etc.

Insulators also have very important role in electrical and electronic circuits, because without them electrical circuits would short together and not work. As an  example, insulators made of glass or porcelain are used for insulating and supporting overhead transmission cables likewise epoxy-glass resin materials are used to make printed circuit boards, etc. while PVC is used to insulate electrical cables so many applications are associated with insulators