#transformer  an electrical device by which alternating current of one voltage is changed to another voltage
  supertype:  #electrical_device  a device that produces or is powered by electricity
  part:  #induction_coil  #primary_coil  #secondary_coil
  subtype:  #coil.transformer  a transformer that supplies high voltage to spark plugs in a gasoline engine
  subtype:  #step-down_transformer  a transformer that reduces voltage
  subtype:  #step-up_transformer  a transformer that increases voltage
     subtype:  #cascade_transformer  a number of transformers in series; provides a high-voltage source
  subtype:  #Tesla_coil  a step-up transformer with an air core; used to produce high voltages at high frequencies
  subtype:  #voltage_regulator__voltageregulator  a transformer whose voltage ratio of transformation can be adjusted

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