510 Prof. Maxwell and Mr. F. Jenkin on the Elementary 

 are measured in electrostatic units, then 



*=f ^ 



L^M* 

 The dimensions of c are therefore ~, 2 ; and in order to reduce 



a current from electromagnetic to electrostatic measure, we must 

 multiply C by v, or 



c=vC (19) 



37. Electrostatic Measure of Electromotive Force. — The sta- 

 tical measure of an electromotive force is the work which would 

 be clone by electrical forces during the passage of a unit of elec- 

 tricity from one point to another. The only difference between 

 this definition and the electromagnetic definition (16 and 27) 

 consists in the change of the unit of electricity from the electro- 

 magnetic to the electrostatic. 



Hence, if q units of electricity are transferred from one place 

 to another, the electromotive force between those places being e, 

 the work done during the transfer will be qe ; but we found (27) 

 that if E and Q be the electromagnetic measures of the same 

 quantities, the work done would be expressed by QE ; hence 



qe = Q~E', 

 but (35) 



q = vQ, 

 therefore 



«=? • • • ( 20 ) 



Thus, to reduce electromotive force from electromagnetic to 

 electrostatic measure, we must divide by v. 



L*M* 

 The dimensions of e are — ^— • 



38. Electrostatic Measure of Resistance. — If an electromotive 

 force, <?, act on a conductor whose resistance in electrostatic 

 measure is r, and produce a current, c, then by Ohm's law 



r =l ( 21 > 



Substituting for e and c their equivalents in electromagnetic 

 measure (equations 19 and 20), we have 



r ~ v*C 

 but (eq. 7) 



R E 

 R= C' 



