ALTERNATE CURRENT GENERATOR. 



And from these, by the method explained in section 8, we obtain the 

 S, 2, continuedfraetion operators whicharegiven in thefollowing table: — 



and from these, as explained in sectioii 9, we obtain the different 

 harmonics of both the armature current and the induced field current. 

 These also are given in tabular form below : — 



The virtual armature current in amperes being equal to 10 \/ \%x'^ 

 is 7^75 amps., and the terminal virtual voltage, being 4^75 times this, is 

 36"8 volts. The no-load voltage for the same exciting current is 62"2. 

 The virtual value of the alternating current induced in the field 

 circuit in amperes being — 



V - ^p 



The copper losses are — 



In the armature, 15 watts. 

 In the field, due to exciting current, 12 watts. 

 In the field, due to induced current, 54 watts. 

 The total iron loss calculated by means of the formula in section 20 is 

 20 watts. 



The total losses are, therefore, 52^4 watts, and, as the output is 

 285 watts, the efliciency is 84 per cent. 



