What are direct current electromagnets?

An electromagnet is a type of magnet in which the magnetic field is produced by the flow of an electric current, disappearing as soon as this current ceases.

The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be changed quickly by controlling the amount of electric current in the winding. However, unlike a permanent magnet that does not require power, an electromagnet requires a continuous supply of current to keep the fields.