Dielectric Material

Partner: Udemy
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Description: What is a dielectric material?A dielectric material is a poor conductor of electricity but an efficient supporter of electrostatic fields. It can store electrical charges, have a high specific resistance and a negative temperature coefficient of resistance.More about dielectric materialsDielectric materials are poor conductors of electricity because they do not have any loosely bound or free electrons that may drift through the material. Electrons are required to support the flow of an electric current. The current flows from the positive to the negative terminal and, in the opposite direction, as free electrons that flow from the negative to the positive terminal.Dielectric materials support dielectric polarization, which enables them to act as dielectrics rather than conductors. This phenomenon occurs when a dielectric is placed in an electric field and positive charges are displaced in the direction of the electric field, while the negative charges are displaced in the opposite direction. Such polarization creates a strong internal field, which reduces the overall electric field within the material.Important considerations for dielectric materialsAn important consideration for a dielectric material is its ability to support an electrostatic field, while dissipating minimal energy in the form of heat. This dissipated heat or energy loss is known as dielectric loss. The lower the dielectric loss, the more effective the substance is as a dielectric material.Another consideration is the dielectric constant, which is the extent to which a substance concentrates the electrostatic lines of flux. Substances with a low dielectric constant include a perfect vacuum, dry air and most pure, dry gases, such as helium and nitrogen. Materials with moderate dielectric constants include ceramics, distilled water, paper, mica, polyethylene and glass. Metal oxides, in general, have high dielectric cons
Category: Teaching & Academics > Engineering > Materials Science
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Price: 19.99
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