# Voltage Definition and Formula

As per voltage definition, it is the difference in the electric potential between two points. It is the work done in moving a charge from one pole to another through a wire.
To determine the voltage between any two points, both a static electric field and a dynamic electromagnetic field is considered.

The mathematical representation of voltage is as follows:

Where,

• V is the voltage in volts
• I is the current in amperes
• R is the resistance in ohms

## SI Unit of Voltage

After knowing the voltage definition and voltage formula, let us learn the SI unit of voltage. The standard unit of measurement used for the expression of voltage is volt which is represented by the symbol v. However, the volt is a derived SI unit of electric potential or electromotive force. For this reason, volt can further be defined in several ways.

Volt can also be defined as electric potential along a wire when an electric current of one ampere dissipates one watt (W) of power (W = J/s).

V = W/A

Volt can be expressed as the potential difference between two points in an electric circuit that imparts one joule (J) of energy per coulomb (C) of charge that passes through the circuit.

It can also be expressed as amperes times ohms, joules per coulomb (energy per unit charge), or watts per ampere (power per unit current).

And finally, volt can be stated in SI base units as 1 V = 1 kg m2 s-3 A -1 (one-kilogram meter squared per second cubed per ampere).
Read more : The difference between voltage and EMF

### Other Electrical Units

Some of the other electrical units are given below.