Voltage is the electrical force that would drive an electric current between two points. Voltage is caused by potential difference between two points. Let’s see Voltage Definition, formula of voltage & Voltage Unit

**Voltage Definition**

Voltage (or potential difference) is defined as the energy required to move a unit charge through an element, measured in volts (V). In other words Voltage is the difference in electrical potential energy of a unit of charge moved between two locations in an electrical field.

To move the electron in a conductor in a particular direction requires some work or energy transfer.

This work is performed by an external electromotive force (emf), typically represented by the battery. This emf is also known as ** Voltage or Potential difference**. The voltage Vab between two points

*a*and

*b*in an electric circuit is the energy (or work) needed to move a unit charge from

*a*to

*b*; mathematically,

Where *W *is energy in joules (J) and *q *is charge in coulombs (C). shows the voltage across an element (represented by a rectangular block) connected to points a and b. The plus (+) and minus (-) signs are used to define reference direction or voltage polarity. The Vab can be interpreted in two ways:

- Ppoint a is at a potential of vab volts higher than point b, or
- The potential at point a with respect to point b is Vab. It follows logically that in general.

**Vab = – Vba**

__Properties of Voltage__

__Properties of Voltage__

- Voltage is always measured as a difference
- Follows Ohm’s Law

**Voltage Unit:**

Voltage or simply Vis measured in volts (V), named in honor of the Italian physicist Alessandro Antonio Volta (1745–1827), who invented the first voltaic battery.

**1 Volt = 1 Joule/Coulomb = 1 Newton-Meter/Coulomb**

**Formula of Voltage**

As per Ohm’s law Formula of Voltage is given by,

**V = IR**

In Ohm’s rule, V is the voltage measured in volts, I is the current measured in amperes, and R is the Resistance measured in ohms

**Measurement of Voltage:**

- Voltmeter measures DC and AC voltage
- Oscilloscope measures voltage changes as function of time (Vv/st)

**Measuring Voltage: Voltmeters**

Voltage is measured using Voltmeter. To measure potential-difference, or voltage, a voltmeter must be connected between two points at different potentials. In other words, a voltmeter must always be connected in parallel with the part of the circuit under test

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