Editing Electric current (section)

==Electromagnetism==
{{Main|Electromagnetism}}

===Electromagnet===
{{Main|Electromagnet}}
[[File:Magnetic field produced by an electric current in a solenoid.png|thumb|A magnetic field is produced by an electric current in a [[solenoid]].]]

In an electromagnet a coil of wires behaves like a [[magnet]] when an electric current flows through it. When the current is switched off, the coil loses its magnetism immediately.
Electric current produces a [[magnetic field]].  The magnetic field can be visualized as a pattern of circular field lines surrounding the wire that persists as long as there is current.

===Electromagnetic induction===
{{Main|Electromagnetic induction}}
Magnetic fields can also be used to make electric currents. When a changing magnetic field is applied to a conductor, an [[electromotive force]] (EMF) is induced,<ref name="SerwayJewett2004" />{{rp|1004}} which starts an electric current, when there is a suitable path.

[[File:Electromagnetic induction - solenoid to loop - animation.gif|thumb|center|Alternating electric current flows through the solenoid, producing a changing magnetic field. This field causes an electric current to flow in the wire loop by [[electromagnetic induction]].]]

===Radio waves===
{{Main|Radio waves}}
{{Further|Radio-frequency current}}

When an electric current flows in a [[antenna (radio)|suitably shaped conductor]] at [[radio frequencies]], [[radio waves]] can be generated. These travel at the [[speed of light]] and can cause electric currents in distant conductors.