Capacitance Formula

There are many Capacitance Formulas. In this article, you will find all the basic capacitance formulas and equations together. These equations and formulas are very important. Before connecting capacitors in any electrical circuits, the calculation must be needed. There are many uses of a capacitor like in filter circuits, power factor improvement circuits, etc. For all applications of capacitors needs the formula and equations.

Capacitance: Capacitance is the property of a capacitor by virtue of which the capacitor can store electrical energy in the form of electrical charge.

The Unit of Capacitance is Farrad which is denoted by 'F'

C = coulomb
V = volt

One(1) Coulomb of charge stored per One Volt applied voltage.

When we apply an electrical voltage to the capacitor then the capacitor stores the electrical energy in the form of an electrical charge.

So we can write,

Where
C= capacitance
Q= charge
V= Voltage or potential difference

Based on the physical characteristics of the capacitor, the capacitance formula is,

Here,
k= relative permittivity
ε₀= permittivity of free space
A = surface area of plates
d=distance between plates

The energy-storing formula of the capacitor is,

Capacitors connected in Series:

When a no. of capacitors is connected in series then the formula of capacitance will be,

Capacitors connected in Parallel:

When a no. of capacitors are connected in parallel then the formula of capacitance will be,

Capacitor Reactance Formula:

The property of a capacitor by virtue of which the capacitor can oppose the flow of alternating current(AC) is called capacitance reactance.
The capacitive reactance is denoted by Xc

Here,
C= Capacitance
f= frequency

The unit of capacitive reactance is ohm

If an AC circuit has only a capacitor the equation of current will be,

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Capacitance Formula | All Formulas and Equations Explain