Magnetomotive force is any physical cause that produces magnetic flux, i.e. any charge or electron in motion. In other words, it is a field of magnetism (measured in tesla) that has area (measured in square meters), so that (Tesla)(Area)= Flux. It is analogous to electromotive force or voltage in electricity. MMF usually describes electric wire coils in a way so scientists can measure or predict the actual force a wire coil can generate.
The standard definition of magnetomotive force involves current passing through an electrical conductor, which accounts for the magnetic fields of electromagnets as well as planets and stars. Permanent magnets also exhibit magnetomotive force, but for different reasons.
The gilbert (Gi), established by the IEC in 1930 , is the CGS unit of magnetomotive force. The gilbert is defined differently, and is a slightly smaller unit than the ampere-turn. The unit is named after William Gilbert (1544 - 1603) English physician and natural philosopher.
where N is the number of turns of the coil, I is the current in the coil, Φ is the magnetic flux and is the reluctance of the magnetic circuit. The latter equation is sometimes known as Hopkinson's law.
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