The magnetomotive force can often be quickly calculated using Amp�re's law.
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I just added a note to the magnetomotive force article to explain this.
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For example, the magnetomotive force \ mathcal { F } of long coil is:
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The gilbert, a unit of magnetomotive force or magnetic potential, was named in his honor.
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A common analogy of a magnetic circuit maps magnetomotive force ( mmf ) to voltage and magnetic flux ( ? ) to electrical current.
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For a closed magnetic circuit ( no air gap ) most core materials saturate at a magnetomotive force of roughly 800 ampere-turns per meter of flux path.
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This model makes magnetomotive force ( mmf ) the analog of electromotive force in electrical circuits, and time rate of change of magnetic flux the analog of electric current.
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Using Hopkinson's law ( magnetic circuit analogue of Ohm's law for electric circuits ) and the definition of magnetomotive force ( magnetic analogue of electromotive force ):
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The unit of magnetomotive force is the ampere-turn ( At ), represented by a steady, direct electric current of one ampere flowing in a single-turn loop of electrically conducting material in a vacuum.
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Another method is to pass an electric current directly through the ingot while it is in a magnetic field, with the resulting magnetomotive force carefully set to be just equal to the weight in order to hold the liquid suspended.
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