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It is the one which is used to produce flux in transformer and main field flux in motor or generator. Flux is proportional to the current passed through the coil.
Flux is inversely proportional to the reluctance of the medium that the flux passes through. Flux is analogous to current. Reluctance is analogous to resistance. MMF is analogous to voltage.
so if there is a coil carrying 5A current and 10 turns it produces 5*10 = 50 Ampere Turns MMF .
so as the current increases MMF increases. If reluctance of the medium used is high there will be more flux.
Let us take a transformer in that in order to produce EMF in the secondary we have to give flux from the primary for that we need a current in the primary that is called Magnetizing current . Any way if we load the transformer , the transformer primary carries (N2 / N1 ) * I2 current in addition to magnetizing current. Apart from these two currents there will be another current which is responsible for core loss in the transformer. Please note that all these three currents are at different phase angles i.e. they are not in same phase.
Medium for the flux in the transformer is core. If it is a iron core reluctance is more , to produce same EMF it will take more magnetizing current. If we use CRGO steel as core reluctance is less. For less magnetizing current itself we get flux for the required EMF in secondary.
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