# Difference Between Electromotive Force and Magnetomotive Force

The magnetomotive force is analogous to the electromotive force in an electric circuit. If an electric circuit's electrons are being propelled by an electromotive force (EMF), then the magnetic flux or field lines are being propelled by a magnetic field force (MMF).

## What is Electromotive Force?

The passage of electrons in an electrical circuit is propelled by electromotive force (EMF). The presence of an electrical charge creates a field surrounding it, which may either attract or repulsion other charged particles. A potential difference is produced when enough of these charged particles are separated.

Electromotive force is the difference in potential that causes an electric current to flow. It's the difference in potential at the battery's terminals when no current is flowing. The conventional sign for electromotive force is "E," and its unit of measurement is "volts."

Electromagnetic fields (EMFs) are a sort of energy that may be transferred back and forth between other types of energy, such as chemical, mechanical, and other forms of energy, and electrical energy. Electrochemical reactions, more often known as batteries, are widely employed as a source of power.

The electromotive force (EMF) keeps the potential difference in a living cell. A generator or battery can change the shape that energy takes. Electromagnetic fields (EMF) are the cause, whereas voltages are the result.

## What is Magnetomotive Force?

MMF, short for magnetomotive force, is the driving force behind the production of magnetic flux in a magnetic circuit and is, therefore, equivalent to the electromotive force. It is this force that creates and sustains the magnetic field in a magnetic circuit. This may be viewed as the initial condition for the flow. It's the force that creates magnetic flux within and around an item. Either a permanent magnet or an electric current passing through a coil can produce it.

A magnetic circuit's magnetic force is driven by a magnetic field, much as an electrical circuit's current is driven by an electromotive force. One ampere passing through one turn of a coil generates a magnetic field or MMF. Ampere-turn is the SI unit used to measure magnetic field strength (AT). Magnetic potential is another name for MMF. It's the ability of a substance to generate a magnetic field.

## Differences between Electromotive Force and Magnetomotive Force

The following table highlights how Electromotive Force is different from Magnetomotive Force −

Characteristics

Electromotive Force

Magnetomotive Force

Definition

Electromotive force (EMF) is a sort of energy that may be exchanged back and forth between other forms of energy (such as chemical, mechanical, or other forms of energy) and electrical energy.

It's the engine that makes the circuit work, propelling electrons along the wires.

In a magnetic circuit, the magnetic field is created and sustained by a force known as the magnetomotive force (MMF).

The magnetic flux within and around an item is established by the magnetic pressure.

Measurement

The electromotive force (EMF) is the potential difference between the two ends when no current is flowing

The conventional sign for electromagnetic field (EMF) is "E," and its unit of measurement is "volts." Magnetic potential is another name for the MMF.

One ampere passing through one turn of a coil generates a magnetic field, or MMF.

Ampere-turn is the SI unit used to measure magnetic field strength.

Formula

The electromotive force (EMF) is the amount of power released by a cell or battery for each coulomb (Q) of charge that flows through it.

The strength of electromagnetic fields is defined as the potential difference between the cell terminals in the absence of current flow.

Electromotive force (E), work (W), and charge (Q) are the three variables in the mathematical statement E = W/Q.

In a coil, the magnetomotive force (MMF) is equal to the product of the current flowing through it and the number of turns, N. (I).

In order to calculate the MMF, you'll need to know the current (I) and the number of turns (N).

The formula for MMF is written as Fm = IN, where Fm is the MMF in ampere-turns, I is current, and N is the number of turns.

## Conclusion

EMF is what causes electrons to travel about in a circuit. Similarly, MMF drives the production of magnetic flux in a magnetic circuit. The electromotive force (EMF) is the resulting potential difference between the two ends when no current is flowing. Its job is to generate current in a certain direction for an electrical circuit. In order to generate MMF, a permanent magnet or a coil's electric circuit must be connected to a power source.

Updated on: 23-Jan-2023

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