388 THE BELL SYSTEM TECHNICAL JOURNAL, APRIL 1951 



Table I 



(ia) CONSTANT VOLTAGE SUPPLY 



(lb) CONSTANT CURRENT SUPPLY 



l'= E/r 



(2a) SERIES BATTERY AND RESISTANCE 



— l|l| — W\/ — 



E R 



(2b) CONSTANT CURRENT SUPPLY AND 

 RESISTANCE IN PARALLEL 



l'=E/r, R'=r2/R 



Oa) SERIES BATTERY AND RESISTANCE 



-H|ih-vw— 



E R 



(3b) SERIES BATTERY AND RESISTANCE 



E' R' 

 E' = (r/R)E, R'=r2/R 



(EQUIVALENT TO (2b), BY 

 THEVENIN'S THEOREM) 



(4a) RESISTANCE 



(4b) RESISTANCE 



(Sa) POWER -SENSITIVE RESISTANCE 

 WITH POSITIVE TEMPERATURE 

 COEFFICIENT 



(5b) POWER -SENSITIVE RESISTANCE 

 WITH NEGATIVE TEMPERATURE 

 COEFFICIENT 



(6a) SHORT-CIRCUIT-STABLE 

 NEGATIVE RESISTANCE 



(6b) OPEN -CIRCUIT -STABLE 

 NEGATIVE RESISTANCE 



r 



E' 



r=E/r, E'=rl 



(7a) CAPACITANCE 



(7b) INDUCTANCE 



L' 



L'=r2c 



