The electric capacitance is a scalar physical quantity that quantifies the aptitude of a conductive material to accumulate electric charge when it has an electric potential with respect to the environment or is subject to an electric potential difference with respect to other conducting bodies. Capacitance is the ratio of the change in an electric charge in a system to the corresponding change in its electric potential. There are two closely related notions of capacitance: self-capacitance and mutual capacitance.

Capacitance is the electrical property of a capacitor and is the measure of a capacitor’s ability to store an electrical charge onto its two plates with the unit of capacitance being the Farad (abbreviated to F) named after the British physicist Michael Faraday.

Capacitance is defined as being that a capacitor has the capacitance of 1 Farad when a charge of 1 Coulomb is stored on the plates by a voltage of 1 volt. Note that capacitance, C is always positive in value and has no negative units. However, the Farad is a very large unit of measurement to use on its own so sub-multiples of the Farad are generally used such as micro-farads, nano-farads, and pico-farads, for example.

Pico-Farad (pF)Nano-Farad (nF)Micro-Farad (μF)Farads (F)

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