26 ELECTRICAL ENGINEERING 



each condenser receives a charge proportional to its capacity, 



Q 3 = 

 and the total charge on the system is 



Q = Qi + Q 2 + Q 3 = E (Ci + C 2 + C 3 ). 

 The capacity of the system is 



c = Q = C + c 2 + c 3 



(49) 



and therefore the capacity of a number of condensers connected 

 in multiple is equal to the sum of their separate capacities. 



23. Condensers in Series. When a number of condensers of 

 capacities Ci, Cz and Cs are conned ^ in series, as in Fig. 21, and 



FIG. 21. Capacities in series. 



a difference of potential E is applied to the terminals of the sys- 

 tem, a charge Q appears on each condenser and the potential E 

 divides up among the condensers in inverse proportion to their 

 capacities. 



The drop of potential across condenser (1) is 



that across (2) is 



and that across (3) is 



* 



Q 



but 



E = El 



