#coil  reactor consisting of a spiral of insulated wire that introduces inductance into a circuit
  supertype:  #reactor  an electrical device used to introduce reactance into a circuit
  subtype:  #armature  coil in which voltage is induced by motion through a magnetic field
     subtype:  #rotor_coil__rotorcoil__rotor  the rotating armature of a motor or generator
  subtype:  #astatic_coils__astaticcoil  an arrangement of coils used in sensitive electrical instruments; the coils are arranged to give zero resultant external magnetic field when a current passes through them and to have zero electromotive force induced in them by an external magnetic field
  subtype:  #choke_coil__chokecoil__choke__choking_coil__chokingcoil  a coil of low resistance and high inductance used in electrical circuits to pass direct current and attenuate alternating current
  subtype:  #field_coil__fieldcoil__field_winding__fieldwinding  the electric coil around a field magnet that produces the magneto motive force to set up the flux in an electric machine
  subtype:  #induction_coil__inductioncoil  a coil for producing a high voltage from a low-voltage source
     subtype:  #ignition_coil  an induction coil that converts current from a battery into the high-voltage current required by spark plugs
     subtype:  #spark_coil__sparkcoil  an induction coil used to create sparks
  subtype:  #primary_coil__primarycoil__primary_winding__primarywinding__primary  coil forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit; "current through the primary coil induces current in the secondary coil"
  subtype:  #read/write_head__head  (computer science) a tiny electromagnetic coil and metal pole used to write and read magnetic patterns on a disk
  subtype:  #secondary_coil__secondarycoil__secondary_winding__secondarywinding__secondary  coil such that current is induced in it by passing a current through the primary coil
  subtype:  #solenoid  a coil of wire around an iron core; becomes a magnet when current passes through the coil
  subtype:  #tickler_coil__ticklercoil  a small coil in series with the anode of a vacuum tube and coupled to the grid to provide feedback

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