ROTARY CONVERTERS. 



The E.M.S. value of e is, therefore, given by 



E 



175 



(1) 



That is, in a mono-phase rotary converter, the 

 E.M.F. on the direct current side is \/2 times 

 the R.M.S. value of the applied P.D. on the alter- 

 nating-current side. 



Again, neglecting losses and difference of phase between the 



applied P.D. and the current, the input is equal to the output, so 

 that if / is the current taken from the commutator, and I\ the 

 E.M.S. value of the supply current, we have 



= ^-L by(l) 



therefore- 



i = \/2I 



(2) 



That is, the R.M.S. value of the alternating cur- 

 rent is equal to \/2 times the direct current. 



CONVERTER. 



12O. Suppose now that n equidistant points round the com- 

 mutator are connected to n collector-rings. 



