Enter the total number of turns or conductors and the current into the calculator to determine the magnetomotive force.

## Magnetomotive Force Formula

The following equation is used to calculate the Magnetomotive Force.

mmF = I * N

• Where mmF is the magnetomotive force (ampere-turns)
• I is the current (amps)
• N is the number of turns or conductors

To calculate the Magnetomotive Force, multiply the current by the number of turns.

## What is a Magnetomotive Force?

Definition:

Magnetomotive force (MMF) is the property that drives currents in coils and causes them to produce a magnetic field.

The MMF value depends on three variables: the number of turns in the coil, the current flowing through it, and its geometric construction (such as whether it has multiple coils or layers).

## How to Calculate Magnetomotive Force?

Example Problem:

The following example outlines the steps and information needed to calculate the Magnetomotive Force.

First, determine the current of the system. In this example, the current is 400 amps.

Next, determine the number of turns in the coil. For this problem, the number of turns is 5.

Finally, calculate the magnetomotive force using the formula above:

mmF = I * N

mmF = 400 * 5

mmF = 2,000 ampere-turns