Dielectric it’s a adjective that is used to qualify the material that, due to its characteristics, it is not a good conductor of electricity. Its electrical conductivity, therefore, is low.
It should be remembered that it is called electricity to force manifested through rejection or attraction between charged particles. To energy form that is based on this force is also known as electricity.
The electric conductivity is the capacity of a body to allow the passage of electric current through it. Good drivers, in this way, do not obstruct that passage, unlike what happens with bad drivers.
Retaking the idea of dielectric, this is how the element that is a bad electrical conductor. This means that the electric current finds great difficulties to pass through a material that is dielectric.
Thanks to their properties, dielectric materials function as insulators. Among them it is possible to name the paper, the ceramics and the glass. Even the air is dielectric, as are other gases and also various liquids (such as Castor oil).
It is important to note that the insulating capacity is not infinite. Dielectric bodies resist a maximum value of electric field intensity known as rigidity dielectric: after this mark, the material becomes conductive.
In this sense, it can be stated that dielectric materials have different degrees of permittivity. This alludes to capacity that they have so that the electric field is established or not.