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That is, magnetic flux = magnetomotive force / reluctance expressed in units, the equation becomes: maxwells = gilberts / oersteds The gilbert is the unit of magnetomotive force, equivalent to the magnetomotive force of .7958 ampere turn.

Magnetomotive Force.—This is a force similar to electromotive force, that is, magnetic pressure.

The fundamental law of the non-homogeneous magnetic circuit traversed by one and the same total magnetic flux Z is that the sum of all the magnetomotive forces acting in the circuit is numerically equal to the product of the factor 0.8, the total flux in the circuit, and the sum of all the reluctances of the various parts of the circuit.

If then the circuit consists of materials of different permeability 228 and it is desired to know the ampere-turns required to produce a given total of flux round the circuit, we have to calculate from the magnetization curves of the material of each part the necessary magnetomotive forces and add these forces together.

It is called magnetomotive force and is analogous to electromotive force, that is, the force which tends to drive an electric current through a circuit.