150 REPORT—1863. 
is measured by the quantity of electricity which passes in the unit of time 
(15) ; if both current and quantity are measured in electrostatic units, then 
at re ¢(:) 
2 Ve i 
qe and in order to reduce a current 
from electromagnetic to electrostatic measure, we must multiply C by v, or 
GERD OY a EET POE ORR ORY 
37. Electrostatic Measure of Electromotive Force ——The statical measure of 
an electromotive force is the work which would be done by electrical forces 
during the passage of a unit of electricity 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 ¢ 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 ge; but we found (27) that if E and Q be the electro- 
magnetic measures of the same quantities, the work done would be expressed 
by QE; hence 
The dimensions of ¢ are therefore L 
| Oa aoe 
but (35) q=Q, 
therefore — i aN Sa 
Thus, to reduce electromotive force from electromagnetic to electrostatic 
measure, we must divide by v. 
rw? 
The dimensions of ¢ are eee 
38. Electrostatic Measure of Resistance—If an electromotive force, e, act 
on a conductor whose resistance in electrostatic measure is r, and produce a 
current, c, then by Ohm’s law 
neBare dias! ianealy: ahh banwinlaast ay 
Substituting for ¢ and ¢ their equivalents in electromagnetic measure (equa- 
tions 19 and 20), we haye 
fod Be 
ere bid 
but (eq. 7) = 
and therefore ees os gover 2 4 + laa | 
To reduce a resistance measured in electromagnetic units to its electrostatic 
value, we must divide by v*. 
The dimensions of 7 are a or the reciprocal of a velocity. 
39. Electric Resistance in Electrostatic Units is measured by the Reciprocal 
of an Absolute VelocityWe have seen from the last paragraph that the 
