Why does an electro magnet work in the same polarity with AC current?

Question

DC current stays consistant and makes sense that the electromotive force would flow in one direction thus causing north and south of a magnetic field. But AC current doing the same thing I don't understand.

Answer 1

AC current doesn't do the same thing as DC in an electromagnet. In a DC electromagnet the poles stay the same polarity. In an AC electromagnetic the north and south poles change at the line frequency.
You could have the same effect with DC if you could switch connections back and forth as fast as the frequency of the AC.

AC and DC electromagnets are built differently because the magnetic lines do not build instantly when power is applied to a coil of wire. When AC is applied this delay is long enough to give you no magnetism when applied to a coil built for DC operation. The on and off properties of AC do not allow the field to build between cycles as with steady DC applied. This is due to the impedance of the coil that is not a factor with DC.
An AC electromagnet has far fewer turns than one designed for DC and the core is built differently to reduce impedance.

Answer 2

This Site Might Help You.

RE:
Why does an electro magnet work in the same polarity with AC current?
DC current stays consistant and makes sense that the electromotive force would flow in one direction thus causing north and south of a magnetic field. But AC current doing the same thing I don't understand.

Answer 3

If a machine is constructed to rotate a magnetic field around a set of stationary wire coils with the turning of a shaft, AC voltage will be produced across the wire coils as that shaft is rotated, in accordance with Faraday's Law of electromagnetic induction. This is the basic operating principle of an AC generator, also known as an alternator:
Notice how the polarity of the voltage across the wire coils reverses as the opposite poles of the rotating magnet pass by. Connected to a load, this reversing voltage polarity will create a reversing current direction in the circuit. The faster the alternator's shaft is turned, the faster the magnet will spin, resulting in an alternating voltage and current that switches directions more often in a given amount of time.

While DC generators work on the same general principle of electromagnetic induction, their construction is not as simple as their AC counterparts. With a DC generator, the coil of wire is mounted in the shaft where the magnet is on the AC alternator, and electrical connections are made to this spinning coil via stationary carbon "brushes" contacting copper strips on the rotating shaft. All this is necessary to switch the coil's changing output polarity to the external circuit so the external circuit sees a constant polarity:

Answer 4

In an AC current the north and south of the field will change with a frequency of the AC.

An iron piece will be pulled to ward the electro magnet what ever its pole.

Answer 5

Dc Electromagnet

Answer 6

--->> Tips---> https://trimurl.im/g54/why-does-an-electro-magnet-work-in-the-same-polarity-with-ac-current