118 



EFFECT OF CAPACITY. 



horizontally, so that idle voltages due to self-induction 

 (which precede the current in phase) are drawn vertically 

 downwards, and idle voltages due to capacity (and which 

 lag behind the current) are drawn vertically upwards. 



The voltage V 2 in the non-inductive resistance 

 is drawn horizontally as OA (see Fig. 56), since 



SCALE Or VOLTS 



10 20 30 40 50 60 70 80 90 100 110 120 



FIG. 56. DIAGRAM OF VOLTAGES IN CIRCUIT WITH CAPACITY AND 

 SELF-INDUCTION. 



this is an energy voltage, and in phase with the 

 current. The voltage V l taken across the inductive re- 

 sistance r will consist partly of energy and partly of idle 

 volts, and is drawn downwards from A, making an obtuse 

 angle with OA. In order to determine the correct 

 position for V l on the diagram, . describe a circle with 



