Everything about Capacitance totally explained
Capacitance is a measure of the amount of
electric charge stored (or separated) for a given
electric potential. The most common form of charge storage device is a two-plate
capacitor. If the charges on the plates are +Q and −Q, and V gives the voltage difference between the plates, then the capacitance is given by
» :
where
C in this case has the units of length.
The dielectric constant for a number of very useful dielectrics changes as a function of the applied electrical field, for example
ferroelectric materials, so the capacitance for these devices is no longer purely a function of device geometry. If a capacitor is driven with a sinusoidal voltage, the dielectric constant, or more accurately referred to as the relative static permittivity, is a function of frequency. A changing dielectric constant with frequency is referred to as a
dielectric dispersion, and is governed by
dielectric relaxation processes, such as
Debye relaxation.
Footnotes
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