# Series Generators

When the field winding is connected in series with the armature winding while supplying the load then the generator is called series generator. It is shown in the Fig. 1.

Field winding, in this case is denoted as S_{1 }and S_{2}. The resistance of series field winding is very small and hence naturally it has less number of turns of thick cross-section wire as shown in the Fig. 1.

Let R_{se }be the resistance of the series field winding.

__1.1 Voltage and current Relations__

As all armature, field and load are in series they carry the same current.

**. ^{.}. **I

_{a }= I

_{se }= I

_{L}

Where I_{se }= Current through series field winding.

Now in addition to drop I_{a }R_{a}, induced e.m.f. has to supply voltage drop across series field winding too. This isI_{se }R_{se }i.e. I_{a }R_{se }as I_{a }= I_{se}. So voltage equations can be written as,

E = V_{t }+ I_{a }R_{a }+ I_{a }R_{se }+ V_{brush}

**. ^{.}. **E = V

_{t }+ I

_{a }(R

_{a }+ R

_{se}) + Vbrush

where E = (?PNZ)

**/**(60A)