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Most generally, a dielectric is an insulator, a substance that is highly resistant to flow of electric current. Layers of such substances are commonly inserted into capacitors to improve their performance, and the term dielectric refers specifically to this application.

The use of a dielectric in a capacitor presents several advantages. The simplest of these is that the conducting plates can be placed very close to one another without risk of contact. Also, if subjected to a very high electric field, any substance will ionize and become a conductor. Dielectrics are more resistant to ionization than air, so a capacitor containing a dielectric can be subjected to a higher voltage.

Also, dielectrics increase the capacitance of the capacitor. An electric field polarizes the molecules of the dielectric, producing concentrations of charge on its surfaces that create an electric field opposed ( antiparallel ) to that of the capacitor. Thus, a given amount of charge produces a weaker field between the plates than it would without the dielectric, which reduces the electric potential. Considered in reverse, this argument means that, with a dielectric, a given electric potential causes the capacitor to accumulate a larger charge.

Topics: Dielectric Strength, Dielectric Waveguide, Dielectric Constant...

DielectricMost generally, a dielectric is an insulator, a substance that is highly resistant to flow of electric current. Layers of such substances are commonly inserted into capacitors to improve their performance, and the term dielectric refers specifically to th	Dielectric strengthIn physics, the term dielectric strength has the following meanings: 1. Of an insulating material, the maximum electric field strength that it can withstand intrinsically without breaking down, i. without experiencing failure of its insulating properties.	Dielectric waveguideIn telecommunication, a dielectric waveguide is a waveguide that consists of a dielectric material surrounded by another dielectric material, such as air, glass, or plastic, with a lower refractive index. An example of a dielectric waveguide is an optical
Dielectric constantIn physics, the dielectric constant is a property of an insulator. It specifies the relative permittivity of a material. Where epsilon is the permittivity of the material in question, and epsilon is the permittivity of free space, the dielectric constant	Dielectric levelA dielectric means a nonconductor of electricity (such as an insulator), or a substance in which an electric field can be maintained with a minimum loss of power. See dielectric.	Dielectric dispersionBecause polarization cannot follow an electric field in a high-frequency field, permittivity has a dependence on the frequency. This dependence is called dielectric dispersion . It is very important for the application of dielectric materials and the anal

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Topics: Dielectric Strength, Dielectric Waveguide, Dielectric Constant...