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Why insulators are called as dielectric materials?

A dielectric material is an electrical insulator that can be polarized by an applied electric field. When a dielectric is placed in an electric field, electric charges do not flow through the material as they do in a conductor, but only slightly shift from their average equilibrium positions causing dielectric polarization.

electrical insulator

electrical insulator

Electrical insulator is made of porcelain, glass and polymer, also known as porcelain insulator, glass insulator and polymer insulator used for electrical systems.

Why insulators are called as dielectric materials?
Because of dielectric polarization, positive charges are displaced toward the field and negative charges shift in the opposite direction. This creates an internal electric field that reduces the overall field within the dielectric itself. If a dielectric is composed of weakly bonded molecules, those molecules not only become polarized, but also reorient so that their symmetry axis aligns to the field.

Electrical insulators can be called dielectric materials, because the insulating resistance for insulators. Silicone rubber insulator is popular used on overhead lines in the world.

 

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