Difference Between EMF and Voltage

In order to know the difference between emf and voltage, we should be aware that EMF stands for electromotive force and is referred to the voltage present at the ends of the source in the absence of current. And when we close the circuit for letting the electric current flow, then, there is a presence of voltage at the ends of the source.

Difference Between EMF and Voltage

Difference Between EMF and Voltage

The voltage found is very small compared to emf and it is the result of the internal resistance of the source itself which is leading the drop in the voltage.

EMF is electrically charged particles as a result of separation of electrons from the atoms by consuming some types of energy such as chemical, mechanical or light.

EMF= A/Q (where, A= amount of work performed and Q= amount of electricity)

Voltage is the difference of the electrical states on the poles. In a closed electrical circuit, electrons move from the negative half to the positive half. Electrical voltage is referred to the work performed by the electric force in moving the charge from one point of the field to another

Difference Between EMF and Voltage



It denotes the voltage produced inside the electric source.

It is the difference potential difference between two points

External forces work in moving a charge from one pole to another pole inside a source

It is the work in moving a charge from one pole to another through a wire

E = I * (R + r)

V = I * R

It follows the coulomb force operation

It follows a non-coulomb force operation

It measured with EMF meter

It is measured with voltmeter

It is always greater than voltage

It is always lesser than EMF

Its intensity is constant

Its intensity is not constant

EMF are caused in gravitational, electric or magnetic field

Voltage is caused only in electric field

These were some difference between EMF and Voltage. If you wish to find out more, download BYJU’S The Learning App.


Practise This Question

Statement 1: Evaporation causes cooling of the liquid

Statement 2: During evaporation, the surface molecules with high kinetic energy get evaporated.