Difference between revisions of "Capacitance"
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'''Capacitance''' is a property of [[electric]] [[circuit]]s 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 volume. | '''Capacitance''' is a property of [[electric]] [[circuit]]s 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 volume. | ||
| − | Because of this inverse relationship, most capacitors are quite large | + | Because of this inverse relationship, most capacitors are quite large compared to other parts on a circuit board, and still only power circuits in the range of a few microfarads. (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 range are being developed in [[Britain]].<ref>[http://www.engineerlive.com/news/20026/iec-to-develop-standard-for-supercapacitors.thtml IEC to develop standard for supercapacitors]. ''EngineerLive'', March 27, 2008.</ref> |
==References== | ==References== | ||
Revision as of 17:35, April 3, 2008
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 volume.
Because of this inverse relationship, most capacitors are quite large compared to other parts on a circuit board, and still only power circuits in the range of a few microfarads. (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 range are being developed in Britain.[1]
References
- ↑ IEC to develop standard for supercapacitors. EngineerLive, March 27, 2008.