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What is the formula for MMF in transformer?
Knowledge Base + 2024.01.12

The Magnetomotive Force (MMF) in a transformer is calculated using the formula:



  • MMFMMF is the magnetomotive force measured in ampere-turns (AT).

  • N is the number of turns in the coil (number of windings of the transformer).

  • I is the current flowing through the coil measured in amperes.

This formula expresses the product of the number of turns and the current as the magnetomotive force. The MMF is a key parameter in understanding and analyzing the magnetic circuit in transformers. It represents the force that establishes the magnetic field within the transformer's core.

What is the difference between EMF and MM

Hint :EMF stands for electromotive force. EMF is the force that is responsible for driving the electrons in an electric circuit. Magnetomotive force is abbreviated as MMF. MMF is the driving force required to drive the magnetic flux through the circuit.

Complete Step By Step Answer:

EMF stands for electromotive force.MMF stands for magnetomotive force.
EMF acts as the driving force responsible for the movement of the electrons in an electrical circuit. EMF refers to the amount of work required to separate the charge carriers in a source current so that the force acting on the charges at the source's terminals is not a direct result of the field. Internal resistance causes the development of emf.EMF is greater than the potential difference between any two points in a circuit.If we make current flow through a conductor coil, a force is produced that drives magnetic lines of flux known as magnetomotive force or MMF. In short, it is a driving force responsible for the creation of magnetic flux in a magnetic circuit.
The SI unit of EMF is volts.The force is measured in Ampere-turn  (AT).
We can mathematically express EMF as,  E=WQWhere  Eis the electromotive force Wis the work done Qis the chargeWe can mathematically express MMF for an inductive coil as,  F=NIWhere  Fis the magnetomotive force Nis the number of turns Iis the current.

Note :

The term EMF refers to the voltage produced by a source, such as a generator, battery, or photocell. In the case of magnetic circuits, the term MMF is used. In magnetic circuits, the term MMF is analogous to the term EMF in electric circuits.The magnetomotive force can also be expressed as the product of magnetic flux and magnetic reluctance (F=φR)