#electromagnet  a temporary magnet made by coiling wire around an iron core; when current flows in the coil the iron becomes a magnet
  supertype:  #magnet  a device that attracts iron and produces a magnetic field
  subtype:  #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
  part:  #armature
  part of:  #electric_bell  a bell activated by the magnetic effect of an electric current
  part of:  #electrical_relay__relay  electrical device such that current flowing through it in one circuit can switch on and off a current in a second circuit
     part of:  #electrical_circuit__circuit__electric_circuit  an electrical device that provides a path for electrical current to flow
        part of:  #electronic_equipment  equipment that involves the controlled conduction of electrons (especially in a gas or vacuum or semiconductor)

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