electromagnet

a temporary magnet made by coiling wire around an iron core; when current flows in the coil the iron becomes a magnet

• magnetic head — an electromagnet (as on a tape recorder) that converts electrical variations into magnetic variations that can be stored on a surface a later retrieved

• magnet — a device that attracts iron and produces a magnetic field

• armature — coil in which voltage is induced by motion through a magnetic field

• electric bell — a bell activated by the magnetic effect of an electric current
• relay, electrical relay — electrical device such that current flowing through it in one circuit can switch on and off a current in a second circuit