An electromagnet can be constructed by wrapping an iron or steel bar with a current-carrying wire. When used as the core of an electromagnet, the ferromagnetic properties of iron or steel allow the magnetic domains to align. Wrapping a nail or other steel item with insulated wire, which is then hooked up to an electrical current, will magnetize the core. When powered, electromagnets function just like permanent magnets.Continue Reading
The first electromagnet was invented in 1820. The simple physics governing electromagnetism allows anyone to construct such a magnet using common everyday items. A large iron or steel nail, at least 3 inches or longer, makes a suitable core for a simple electromagnet. Household D-size batteries produce an electrical current that is strong enough to create an operational magnet. Tightly wrapping the nail or other object with coated or insulated copper wire and ensuring the ends are exposed and able to be connected to the battery is all that is required.
Once the wire is attached to a power source and current is passed through it, the core becomes magnetized and will possess enough force to attract certain types of metals. Once disconnected from its power source, an electromagnet will no longer function.Learn more about Magnetism
To build a powerful electromagnet, use an iron nail, railroad spike or ferrite rode as a magnetic core. Take 1 inch of the coating from the end of a 22-gauge insulated wire. Use an all-purpose adhesive to attach the wire to the core, and then wrap it around the core from end to end as tightly as possible without the wire overlapping itself. Use the adhesive to attach the other end of the wire to the core.Full Answer >
The electromagnet was invented in 1825 by William Sturgeon, a prominent British electrical engineer who lived between 1783 and 1850. The first practical electromagnet was a horseshoe-shaped piece of iron with loosely wound, uncoated wire.Full Answer >
A magnetic contactor works by creating a connection between the motor and the electromagnet. When the start button is pressed in a magnetic starter, an electromagnet gets energized and the contactor gets engaged. As a result, the current runs to the motor.Full Answer >
Iron is magnetic except when heated to the Curie point. The Curie point, which is sometimes called the Curie Temperature, is the temperature at which some magnetic materials undergo a major change in their structure.Full Answer >