Farad

Farad is the SI unit of electrical capacity. It was named after Michael Faraday.

A capacitor having a capacity of one farad (F) can be obtained by charging at a voltage of one volt (V) store a charge of a Coulomb ( C):

Clearly, one can describe this relationship by:

  • A capacitor which is charged by a current of one ampere in one second at a voltage of one volt, with a capacity of one farad.
  • A capacitor ( one coulomb ) is charged to a voltage of a voltage by a charge amp of a second, has a capacity of one farad.

Most capacitors have capacities from a few picofarads (pF ) and a few microfarads ( uF ). Since about 1990 double-layer capacitors are available, have the capacity in the order of several farads, in later developed the so-called ultracapacitors or supercapacitors also of several thousand farads. Double-layer capacitors are available under various brand names such as GoldCap or Green Cap. They serve as a replacement or supplement for batteries, such as memory devices and real-time clocks.

Prefixes

Common decimal parts of Farads are:

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