Magnet iron absorption of energy from where come of?
Magnet factory strong magnet energy is derived from its own magnetic field, which is formed by the magnetic field and its essence is the electromagnetic field, the alternating electromagnetic field and can directly change into energy/magnetic field is different, usually static magnetic field must be formed by means of relative motion of the conductor alternating electromagnetic field effect.
So strong magnet is a crucial part of the generator, maybe contemporary generator is not necessarily by the strong magnets to form a magnetic field, is also likely is an electromagnetic coil winding to form enough electromagnetic field!
But in small generators or many simple in type of dc generator is still strong magnet materials pole!
A: why do the ferromagnetic material can be attracted by strong magnet?
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