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Capacitance is a property of electric circuits that describes how much electricity is stored between two plates or wires. It is defined as C=Q/V, where C stands for capacitance, Q for charge, and V for voltage.

Because of this inverse relationship, most capacitors are quite large compared to other parts on a circuit board. (The farad, named for Michael Faraday, is the unit of capacitance in the SI system.) Recently, by packing many curved plates into a single cylindrical capacitor, electronics companies have been able to shrink the volume of a capacitor by factors of two or three, thus producing a corresponding boost in farad capacity. It is now possible to buy capacitors as powerful as one or two farads, and super-small capacitors in the kilofarad (one thousand farads) range are being developed in Britain.[1]


  1. IEC to develop standard for supercapacitors. EngineerLive, March 27, 2008.
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