EFFECT OF CAPACITY. 



115 



voltage OEy The angle $>, which may be either an angle 

 of lead or of lag, is then the angle E z E a . 



The importance of this combination is chiefly due to 

 the use of condensers in certain special cases, in order to 



SCALE OF VOLTS & AMPERES 



5 10 15 20 2.5 30 



FIG. 54. DIAGRAM OF CURRENT AND VOLTAGE IN CIRCUIT WITH CAPACITY 

 AND SELF-INDUCTION. 



reduce the angle of lag in an inductive circuit and thus 

 to improve the power factor. 



Impedance of Circuit containing both Inductance and Capacity. 



Since the energy voltage is C R, and the idle voltage of 



/ C \ 



the circuit is (^TrnLC-- $). the expression for the 

 \ A TT n A/ 



total voltage may be written 



E f~ ~T 



Hence impedance =~Q= V -R 2 + (' 



c - - v 8 ' - 2^#; 



If < = the angle of lag of the circuit, from the Fig. 



tan < = 



%7rnK 



CR 



_,/ 

 and the angle of lag = tan ( 



2 TT n L 



