The Effect of Temperature on the Absorbed Charge and on the Capacity of Some Electric Condensers

Anthony Zeleny
1915 Physical Review  
A STUDY of the effect of temperature on the absorbed charge in electric condensers may aid in the development of a more complete theory of this charge and lead to a better understanding of what specific factors produce the various observed differences in its magnitude and behavior. The experiments described in this paper were undertaken to obtain some additional data 2 for that purpose. The effect of temperature on the capacity of the condensers under observation was determined at the same time
more » ... ed at the same time and these results are also given. The term "free charge capacity"* will be used to designate the capacity as measured by the free charge augmented by that part of the absorbed charge which passes through the galvanometer during the small fraction of a second it is connected to the condenser. The time allowed for the discharge is not much greater than is necessary to insure the whole measurable part of the free charge to pass through the galvanometer. The term "true capacity" 3 will be used to designate the capacity as measured by the free charge alone. Its value is obtained by extrapolation from the "free charge" capacity values at several different known periods of discharge. A diagrammatic sketch of the apparatus employed for the direct measurement of the absorbed charges is shown in Fig. I . In the position of the keys shown, the condenser C is charged through a resistance R±. When the key K± is tripped by the pendulum (not shown), the condenser is short-circuited through another resistance, i^2, usually from .01 to .03 second and until the key K 2 is tripped. Then the absorbed charge, as 1 A preliminary paper was read at the Washington meeting of the Physical Society, Dec.
doi:10.1103/physrev.6.478 fatcat:oysbgblwjzasnn45ldurb3bzuq