# 9 Difference between EMF and MMF | Online Calculation

In electrical and magnetic circuits, electromotive force (EMF) and magnetomotive force (MMF) are playing vital roles respectively.

But, these two forces have different specifications which are used for different fields or circuits.

Let’s study what is the difference between electromotive force (EMF) and magnetomotive force (MMF).

### Difference between EMF and MMF [in Tabular Form]

#### 8. How to calculate the EMF and MMF?

According to the Ohm’s law of an electric circuit, EMF is calculated by using the formula,

`Electromotive force, (EMF) = (Electric current * Resistance) = (I * R)        (Unit-Volt)`

You can calculate the EMF by using online calculator.

`Total electromotive force, Ʃ(EMF) = (IR1+IR2+IR3+…+IRn)         (Unit-Volt)`

And the general formula of electromotive force or EMF is-

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

According to the Ohm’s law of magnetic circuit, EMF is calculated by using the formula,

`Magnotomotive force, (MMF) = (Magnetic flux * Reluctance) = (ɸ * S)   (Unit-Ampere-Turn)`

Calculate the value of MMF by using online calculator.

`Total magnotomotive force, , Ʃ(MMF) = (ɸS1+ɸS2+ɸS3+…+ɸSn)          (Unit-Ampere-Turn)`

#### 9. Circuit Diagram of Electrical and Magnetic Fields

When current flows through the conductor, electromotive force (EMF) is produced to move the electron. Thus, emf is responsible for to flow of current in a closed electric circuit.

You will see a given electric circuit diagram.

Similarly, in the magnetic circuit, magnetic lines or fluxes are generated due to the existence of magnetomotive force (MMF).

These 9 points are covered the major difference between EMF and MMF with the help of the circuit diagram.

If you have any queries regarding emf vs mmf, you can ask in the comment section.