CONTENTS 



riTAPTl.i; I 



PAGE 

 I'.I.LMF.NTARY PlUNCII'LKS OK COMIDfUODB CUBUM ... 1 



i. Tin- eleetne un-.-nt and its .-fr.-,-- notive foi 



-Insulators Resistance Wire table. 4. Units of 

 dim iit. e.m.f., resistance, quantity. .5. Ohm's Law. 6. Joule's 

 eneruy and power. 7. Potential and Difference of Potential. 

 8. Magnetic field, law of tin- magnetic circuit. 9. Ferro magnetism 

 ll\ it i,,n of an e.m.f. by a conductor cutting 



flux. 11. 1'on-e between a current and a magnetic field. TJ. 

 involved in the operation of generators and motors. 



< ii \ITI:R n 



s or A DYNAMO ELECTRIC M 



1. Field frame Leakage Poles and jH.le shoes. 2. Armature 

 Lamination- hysteresis and eddy CUM iir duets 



ilation. 3. Commutator Functi. .11. : coii.>truetion, 



number of bar- ! I '.rushes and brush rigging Pressure of brushes 

 vin density in brush contact surface. 5. Field uinding 



Calculation of ampere-turns required --Win? or ribbon Heating 

 minatlOn of pTO] luctor. *. Armature windings 



and drum O|x>n and closed Number of paths Current 

 ity Typical windings Formed coils Insulation of winding. 



CHAI'TKI; HI 



CONTINUOUS CURRENT OEM 93 



1. fall-illation of e.m.f. and wave form of single coil machine; 

 two coil; multiple coil Variation of voltage on ordinary machine 



