Figure 1. Drawing of a capacitor with the capacitance, 400 microfarads, that is 0.000 004 farads.[1]

The farad is a unit of capacitance, named after physicist Michael Faraday, used to describe storage of charge in capacitors.[2] The unit for the farad is coulombs per volt (C/V). This describes a case of two oppositely charge plates, each with a coulomb of charge, and a potential difference of one volt between them.

A farad is a large capacitance for most capacitors. Typically electronic applications of capacitors deal with capacitance in the picofarads (10-12 F) to microfarads (10-6 F), however usage of capacitors range all the way up to kilofarads (1000 F). These larger capacitors are often called supercapacitors.[3] Larger capacitors would allow for better energy storage so much research is being done to develop larger capacitors.

For Further Reading


  1. "Electrolytic Capacitor, Radial, 16x30 (Coloured)" Licensed under Public Domain via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Electrolytic_Capacitor,_Radial,_16x30_(Coloured).svg#/media/File:Electrolytic_Capacitor,_Radial,_16x30_(Coloured).svg
  2. WhatIs.com. (2015, Mar.7). What is a Farad [Online]. Available: http://whatis.techtarget.com/definition/farad-F
  3. Battery University. BU-209: Supercapacitor [Online]. Available: http://batteryuniversity.com/learn/article/whats_the_role_of_the_supercapacitor