kokonaispermittiviteetti

Kokonaispermittiviteetti, known in English as total permittivity, is a term used in physics and electrical engineering to describe the overall ability of a material to store electrical energy in the form of an electric field when subjected to an external electric field. It is a measure of how an electric field affects, and is affected by, a dielectric medium. This property is crucial in understanding the behavior of capacitors and other electronic components.

The concept of total permittivity encompasses both the permittivity of free space (vacuum permittivity, denoted by epsilon-nought) and the relative permittivity of the material itself (dielectric constant, denoted by epsilon-r). The relationship is expressed by the formula epsilon = epsilon-nought * epsilon-r, where epsilon represents the total permittivity. The permittivity of free space is a fundamental physical constant, while the relative permittivity is a dimensionless quantity specific to each material.

Materials with high total permittivity are effective at storing electrical energy and can reduce the electric field strength within them compared to a vacuum under the same conditions. This property is why dielectric materials are inserted between the plates of a capacitor; they increase the capacitance without increasing the physical size of the device. The value of total permittivity can vary significantly depending on the material's composition, temperature, and frequency of the applied electric field. Understanding kokonaispermittiviteetti is essential for designing and analyzing electrical circuits and devices that rely on the presence of dielectric materials.