THE CONTINUOUS CURRENT GENERATOR 131 



In Fig. 82 are shown the magnetization curve, curve 

 of generated e.m.f. and external characteristic (terminal 

 voltage) of a separately excited generator. The same 

 curves are given for a series generator in Fig. 83, for a shunt 

 generator in Fig. 84, and for a compound generator in Fig. 

 85. In each case the dotted curve is the magnetization 



Load Current 

 FIG. 83. External Characteristic of a Series Generator. 



curve, the dot-and-dash curve the curve of generated e.m.f. 

 and the solid line curve the terminal voltage. 



Separately Excited Generator. The separately excited 

 generator has a constant field current as the load changes, 

 but the curve of generated e.m.f. decreases slightly with 

 load increase because of demagnetization by the armature. 



Series Generator. In the series generator the m.m.f. 

 of the field is directly proportional to the load current 

 and so the generated voltage is nearly proportional to the 



