An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting 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.
invented by
A lighter is a portable device which generates a flame, and can be used to…
invented by
An internal combustion engine (ICE or IC engine) is a heat engine in which the…
invented by Alessandro Volta
The voltaic pile was the first electrical battery that could continuously…
invented by Francis Ronalds
An electrical telegraph was a point-to-point text messaging system, used from…
Suggest an invention you think it should be here
Inventions that changed the world
Leave a Reply