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Capacitors - Capacitors A capacitor is an electrical...

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Capacitors A capacitor is an electrical circuit element made out of two conductive surfaces placed very close together without touching. A voltage difference is applied across them and equal but opposite charges develop on the opposing surfaces. The idealized version of this element is the parallel plate capacitor . It is depicted to the right as a pair of identical metal plates of area A with a non-conducting dielectric sandwiched in between of width d . The dielectric improves the capacitor because of its high electrostatic permittivity. Often, this permittivity is represented as the product of a dielectric constant , κ , and the permittivity of free space, ε . The capacitor’s parameters come together in a single physics quantity called the capacitance , which simply measures how much charge the capacitor can hold at a given voltage. The equation for the capacitance is C= ε A/d (or C= κε A/d ), where C is measured in farads ( F ).
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