- TK\ Kl vii 



( IIAITKR VI 



FACE 



ELEMENTARY PIUNCIPLES OF ALTKHNATIN., CURRENTS ............ 196 



1. Wnvo shape Frequency KtTectivo values Vector ropre- 

 "ii. j. Phase displacement Power Power factor. 3. \\ 



.Measurement }>v v -ion of po\\er 



factor. 4. Resistanceof an a-c. circuit Ski:. '. Induct 



7. Current in circuit.- eontainiim resistances, intiuct- 

 ity Parallel and series circu i* - v K >onan-e. 



(11 AFTER VII 

 THK AI/J NERAFOR 229 



1. Construction Stationary or n-volvinn ti- 

 1 ieM \\iiuliiiK -Siimle phase ami poly- 



phase. 3. Armature reaction. J Rating of a-c. machinery in 

 It amperes. 5. Chant* urv-s. i'. Tirrill regiila- 



ors in parallel .,p-ration. s. - .. ( 'ir- 



culatr U). Division of load. 



TRANSFOIUIEU 273 



1 I lrn|Mirtaiice of tin- transformer. 



Construction Core type, hhell t\p- T\p- II I. animation of 

 coils. 4. Coolinu' " Ixwses Their variation \\iih load Detcr- 

 inination of loss's Kfficiency Regilla leakage. 



7. A Unlay \. 8. Aut<>-traiwfonuor. 9. Constant current 



trans; ansfonner Iiwirunn-nt tran-t'orincrs 



Testing transformer- 1 1. Polyphase transformer. 



i\ 

 nod Movom. . 309 



1. l-'.-a.-ilMlity i.f runnini: Ml al'.-rnator as a motor. 2. Starting 

 chani< -Use of damping | S|M>ed-load curves. 4. 



Phase charact* nn <>\ power factor. ~>. Mlfctrically 



Won tran>ini>sion i Phase shift irm 



uith loa'l \ariation. s. Hunt int. '.. Mechanical analogy of 

 ronous motor. 



