electromagnet

thumb|A simple electromagnet consisting of a coil of wire wrapped around an iron core. A core of ferromagnetic material like iron serves to increase the magnetic field created. The strength of the magnetic field generated is proportional to the amount of current through the winding.

AI overview

An electromagnet is a coil of wire wrapped around an iron core that produces a magnetic field when electric current flows through it. The strength of this magnetic field depends on how much current runs through the wire, making electromagnets useful devices whose magnetic power can be controlled by adjusting the electrical input.

AI-generated from the Wikipedia summary — may contain errors.

Key facts

Electronic component.name: Electromagnet
Electronic component.image: Electromagnet-with-9V-battery.jpg
Electronic component.caption: Homemade electromagnet with 9V battery
Electronic component.type: Magnet
Electronic component.working_principle: Oersted's law
Electronic component.inventor: William Sturgeon
Electronic component.invention_Year: 1824
Electronic component.symbol: File:Electric-symbol-electromagnet.png

via Wikipedia infobox

Wikidata facts

Image: Simple electromagnet2.gif

Show 3 more facts

time of discovery or invention: 1825-00-00
Commons category: Electromagnets
Commons gallery: Electromagnet

Sources (4)

via Wikidata · CC0

~32 min read

Article

24 sections

Contents

History
Applications of electromagnets
Simple solenoid
Physics
Magnetic core
Ampere's law
Force exerted by magnetic field
Magnetic circuit
Magnetic field in magnetic circuit
Closed magnetic circuit
Force between electromagnets
Side effects
Ohmic heating
Inductive voltage spikes
Lorentz forces
Core losses
High-field electromagnets
Superconducting electromagnets
Bitter electromagnets
Explosively pumped flux compression
Definition of terms
See also
References
External links

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of copper wire wound into a coil. A current through the wire creates a magnetic field which is concentrated along the center of the coil. The magnetic field disappears when the current is turned off. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.