What is electrical insulator?

An insulator, also called a ‘dielectric’, is a material that resists the flow of electric charge. Electrical insulator is one of insulator used for electrical systems.

What is electrical insulator

In insulating materials valence electrons (outermost electrons in the atoms) are tightly bonded to their atoms. These materials are used in electrical equipment as insulators or insulation.

The function of electrical insulator:
◆ To support or separate electrical conductors without allowing current through themselves.

About types of electrical insulators
◆ Some materials such as glass, paper or Teflon are very good electrical insulators and are "good enough" to insulate electrical wiring and cables.
◆ Most plastics can serve as practical and safe insulators for low to moderate voltages (hundreds, or even thousands, of volts).

In the special conditions, electrical insulator can be used as conductor. For example,
Electrical insulation is the absence of electrical conduction. Electronic band theory (a branch of physics) says that a charge will flow if states are available into which electrons can be excited. This allows electrons to gain energy and thereby move through a conductor such as a metal. If no such states are available, the material is an insulator.

 

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