Electrical Machines
For an ideal transformer the winding should have

 no ohmic resistance on either side
 equal resistance on primary and secondary side
 minimum resistance on primary side and maximum resistance on secondary side
 maximum resistance on primary side and least resistance on secondary side

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Electrical Machines
DC Motor

  dc shunt motor with field weakening.
  dc compound motor.
  dc series motor.
  dc shunt with armature resistance control.

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