# Difference between EMF and Potential Difference | Online Calculator

In an earlier tutorial, we have studied all the basic concepts of voltage, potential difference, and electromotive force.

Now, study here- Is electric potential and EMF are same terms?

### Difference between EMF and Potential Difference

Let’s compare the different specifications of electromotive force and potential difference in tabular form.

#### 11. Circuit Diagram of Electrical Circuit

• Electromotive force representation in an electric circuit:

The electromotive force (EMF) provides the energy that can continuously flow free electrons and produce electricity through a conductor in a specific direction.

• Potential difference representation in an electric circuit:

In an electrical circuit, when the electric current passes through the resistive load, the voltage changes between two terminals (i.e. ‘A’ and ‘B’).

In between two given ‘A’ and ‘B’ terminals, the occurring voltage is called a ‘Potential Difference’. And sometimes this changing voltage is called as a ‘Voltage Drop’.

Note: In the above diagram, point ‘A’ represents the higher potential (+ve terminal), and point ‘B’ represents the lower potential (-ve terminal).

#### 12. Calculation of EMF & Potential Difference

• Electromotive force calculation:

The formula of electromotive force or EMF is-

`Electromotive force, (E) = [I * (R + r)]                    (Unit- Volt)`

Where,

I – Electric current is passing through the circuit.

R – External resistance

r – Internal resistance

• Potential difference or voltage calculation:

The formula of potential difference or PD is-

`Potential difference or voltage, (V) = ( I * R)           (Unit- Volt)`

These 12 points have covered the difference between emf and potential difference with help of the circuit diagrams.

### Similarities between EMF and Potential Difference

The SI unit ‘Volt or V’ is the similarities of electromotive force and the potential difference.

If you have any queries regarding the distinguish between emf and potential difference, ask in given comment.