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CAPACITANCE
As
these figures and formulas indicate, capacitance is a measure of
the ability of two surfaces to store an electric charge.
Separated and isolated by a dielectric (insulator), a net
positive charge is accumulated on one surface and a net negative
charge is stored on the other surface.
In an ideal
capacitor, charge would be stored indefinitely; however, real
world capacitors gradually lose their charge due to leakage
currents through the non-ideal dielectric.
Additionally, an
inductive component is present due to metal leads (if present)
and characteristics of the plate surfaces. This inductance, in
combination with the capacitance, creates a resonant frequency
where the capacitor looks like a pure resistance.
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