﻿when Producing a Current. 



275 



§ 6\ Determination of the Electromotive Force of 

 Polarization. 

 By means of the method described in § 5 the results in the 

 following: table were obtained. The units of electromotive 



1-4 



force are approximately — — volts. 



Cell and 

 Date. 



E.M.F. of 



cell open 



=E. 



Potenl 



ial-difference for the cell producing 

 approximately : — 



•0014 ampere 

 r=1000 



legal ohms. 



•0028 ampere 

 r=500 



legal ohms. 



•007 ampere 



r=200 

 legal ohms. 



•01 ampere 



r=l47 

 legal ohms. 



L. July 20... 



5010 









4837 



L. „ 23... 



5009 



4985 



4961-5 



4890-5 





L. „ 25... 



5009 



4983-5 



4959 



4885 





N. „ 25... 



50075 



4959-5 



4912 







B. „ 25... 



5007 



4971-5 



4938-5 



4841 





The simplest way to examine these results will be to cal- 

 culate the electromotive force required to produce the observed 

 current, when the cells are producing currents of different 

 values. Using, then, the equation 



- X potential-difference, 



e = 



with values of R from § 4 and of r from § 5, we have the 



following- values of e : — 





E. 



e 

 for -0014 

 ampere. 



e 

 for -0028 

 ampere. 



e 

 for -007 

 ampere. 



e 

 for -01 

 ampere. 



L 



5010 









4981 



L 



5009 



5005 



5001 



4988 





L 



5009 



5005 



4999 



4983 





N ...... 



5007-5 



4989 



4971 







B 



5007 



5003 



5000 



4990 





From which we obtain the values for E— e, the electro- 

 motive force of polarization being — (E — e). 



