Definition of Separately Excited DC GeneratorA separately excited DC generator is defined as a DC generator where the field winding is powered by an external source.Magnetic or Open Circuit CharacteristicThe curve which gives the relation between field current (If) and the generated voltage (E0) in the armature on no load is called magnetic or open circuit characteristic of a DC generator. The plot of this curve is practically same for all types of generators, whether they are separately excited