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# Voltage

Voltage is usually familiar for an electric circuit. A battery is connected in an electrical circuit, which gives voltage to the circuit. So, when voltage is applying through the circuit, current will flow basically means that the flow of electric charge.

When voltage is high, the current flow through the circuit also high and when the voltage is low, the current flow is also low through the circuit.

Basically, voltage is also known electromotive force. Voltage is the measurement of the potential difference between the two points in an electrical field.

From Ohm's law, we have the expression for the voltage is,

V = IR

Where, V is the voltage of the battery, R is the resistance connected in the circuit, and I is the current flow in the circuit.

From Ohm's law the voltage can be defined as the current flow in the circuit multiplying by the resistance of the circuit.

The unit of voltage is Volt (V).

Voltage is two types:

a) Dc voltage source or Direct voltage source

b) Ac voltage source or Alternating voltage source

An electrostatic field can be created by a voltage, even if no charge carries move. If the voltage will increase in an electrical field between two points separated by a certain distance, the intensity of the electric static field will become higher. But if the distance between the certain points in the electric field increases, the intensity of the electric field will decrease.

So, the relation between the voltage, electric field and the distance between the two points in an electric field is,

V = Ed

Here, V is the voltage or potential difference between two points of the electric field, E is the electric field intensity and d is the distance between the two points in the electric field.

So, voltage or potential difference is the pressure for an electric circuit which pushes the electric charge carrier or electron through a conducting loop to enable the circuit to do work.

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