Electromagnetic Theory -
نویسنده
چکیده
Magnetomotive force (mmf) Magnetomotive force is the flux producing ability of an electric current in a magnetic circuit. [It is something similar to electromotive force in an electric circuit]. [Unit of magnetomotive force is ampere (A)] Note: Although some books use the term ampere-turns, it is strictly not correct as turns is not a dimension] mmf I = Σ I Consider a coil having N turns as shown. It will link the flux path with each turn, so that total current linking with the flux would be Σ I = N.I Thus from Ampere’s Law, the mmf produced by a coil of N turns would be N I, and N I = H l.
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