74 INDUSTRIAL APPLICATIONS. 



When the permanent regime is attained, the expressions for the 

 primary current and the secondary one are of the form 



I = Asin27r -</> =Asinw(/-<T), 

 I' = A' sin 27r ( - <>' = A' sin w/ - <'T 



( ^ - </>' j = A' si 



The constants of the circuits being defined as before (544), if 

 we put 



M 2 o> 2 



* 



MV 



R' 2 + L' 2 to 2 ' 

 we have 



LL'-M 2 2 

 M 2 o> 2 i z RR' 



L L 



The energy expended over the whole of the circuits in unit time is 



A 2 A' 2 

 + R' 



2 2 



and the energy transformed 



The fraction of the total energy transformed, or the coefficient of 

 transformation, is 



W R'A' 2 i 



W RA 2 + R'A' 2 R R' 2 + L' 2 o> 2 ' 



I+ E/ M 2 > 2 



