Magnetomotive Force (mmf)

Definition - What does Magnetomotive Force (mmf) mean?

A Magnetomotive Force is the quantity that appears in an equation for magnetic flux in the magnetic circuit. It is sometimes called the Hopkin's law and magnetic potential. It is considered to be analogous to the voltage or the electromotive force in electricity as it is the reason for the magnetic flux in the magnetic circuit. Ampere-turn is the standard unit of Magnetomotive Force. Ampere-turn is represented by a constant and one ampere of direct electrical current that flows in a single turn loop of the material electrically conducted in a vacuum.

Petropedia explains Magnetomotive Force (mmf)

Magnetomotive Force is a property of certain phenomena or substances that results in the magnetic field. It is considered to be having a great role in the equation of Hopkin's law which is analogous to the voltage in electricity. A unit called gilbert is also sometimes used for quantifying the Magnetomotive Force. Gilbert is slightly different and smaller than ampere-turn. Ampere-turn can be converted into gilberts by multiplying it by 1.25664 and conversely multiplied by 0.795773. Permanent magnets exhibit the Magnetomotive Force, despite of it involving current passing via an electrical conductor. It is also considered that Sun generates this force, notably in the proximity of sunspots.

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