It is a device that generates electromagnetic power through electricity. A conductive winding that matches its power is wrapped around the outside of the iron core. This coil with current is magnetic like a magnet, and it is also called an electromagnet. We usually make it into a strip or hoof shape to make the core more easily magnetized.
Electromagnet has many advantages: whether the magnetism of the electromagnet can be controlled by on and off current; The size of the magnetism can be controlled by the strength of the current or the number of turns of the coil; The magnetic size can also be controlled by changing the resistance to control the current size; Its magnetic poles can be controlled by changing the direction of the current, and so on. That is, the strength of magnetism can be changed, the magnetism can be controlled, the direction of the magnetic pole can be changed, and the magnetism can disappear due to the disappearance of the current.
Electromagnet is an application of magnetic effect of current (electromagnetism), which is closely related to life, such as electromagnetic relays, electromagnetic cranes, maglev trains, electronic door locks, intelligent channel turns, electromagnetic flowmeters and so on.
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