LABORATORY GUIDE IN PHYSIOLOGY. 



will produce 1 ampere of current after overcom- 



ing 1 ohm of resistance. 



" The ohm, the ampere and the volt are thus closely 

 related, and if any two of them be known with ref- 

 erence to any particular electric circuit or portion 

 of a circuit the value of the third may be readily 

 inferred." [Daniell]. For if C=| then E = CxR 

 and R=]y Tne same relations maybe expressed thus: 



1 ampere curren t = 1 ,;. or 1 ampere=! 



Therefore (1) Volts = AmperesxOhms. 



(2) Amperes = Volts-5-Ohms, 



(3) Ohms = Volts-5-Amperes. 



The small Daniell cell has about 1 volt E. M. F. 

 and 4 ohms resistance, the current from such a cell 

 is then equal to approximately % ampere. 



There are numerous other units of measurement 

 used by physicists and electricians, but for our pur- 

 pose it is not necessary to review these more 

 specialized points. 



