# Capacitance

on . Posted in Electrical Engineering

Capacitance, abbreviated as C or CAP, is the ability of a system to store electrical charge.  The capacitance of a system depends on its physical characteristics and the arrangement of its components.  In other terms, capacitance quantifies how much charge a capacitor can store per unit of voltage.  A capacitor is a two terminal electronic component that consists of two conductive plates separated by an insulating material called a dielectric.  The larger the surface area of the plates and the smaller the separation between them, the higher the capacitance.

This equation illustrates that the current flowing into or out of a capacitor is proportional to the rate of change of voltage across the capacitor.  As a result, capacitors are often used in electronic circuits for various purposes, such as energy storage, smoothing voltage fluctuations, and filtering signals.  Capacitance plays a role in the behavior of many electrical systems and is a key parameter in the design and analysis of electronic circuits.

### Capacitance Formula

$$C \;=\; Q \;/\; V$$     (Capacitance)

$$Q \;=\; C \; V$$

$$V \;=\; Q \;/\; C$$

Symbol English Metric
$$C$$ = capacitance $$F$$ $$s^4-A^2\;/\;kg-m^2$$
$$Q$$ = electrical charge that is stored on the capacitor $$C$$ $$A-s$$
$$V$$ = potential difference (the voltage between the capacitor's plates) $$V$$ $$kg-m^2\;/\;s^{3}-A$$

Tags: Electrical