Parallel-Plate Capacitors
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The capacitance of a parallel-plate capacitor (or condenser) is given in SI units by , where is the area of each plate, is the spacing between plates, is the dielectric constant (relative permittivity), and is the permittivity of free space, farad/meter. If is expressed in and in , then microfarads (). Capacitance determines the quantity of positive and negative charges that can be held on the plates by a voltage , such that . In an air-gap capacitor, in which there is no dielectric layer, .
Contributed by: S. M. Blinder (April 2011)
Open content licensed under CC BY-NC-SA
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"Parallel-Plate Capacitors"
http://demonstrations.wolfram.com/ParallelPlateCapacitors/
Wolfram Demonstrations Project
Published: April 20 2011