Practical Electricity: a Laboratory And Lecture Course: Illus
Practical Electricity: a Laboratory And Lecture Course: Illus
W E William Edward Ayrton
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— The aWlute capacity of a condenser can be determined in Digitized by VjOOQ IC 328 PRACTICAL ELECTRICITY. [Chap. VIL farads by using a battery, whose E. M. F. we know in volts, to charge it, when there is in the circuit a galvanomet-er which has been calibrated so that the number of coulombs or fraction of a coulomb that causes any particular instantaneous swing is known. But this absolute measurement of a capacity can more easily be effected as follows, the only thing that is required to be p...reviously known being the value of a resistance in ohms. Let B (right hand, Fig. 125) be a battery of un- known K M. F. and resistance, but of such a large Fig. 125. number of cells, that when it is used to charge the condenser c, F farads in capacity, a suitable instan- taneous deflection is obtained on a reflecting galvano- meter o. In order that we may use two P. Ds., whose ratio is known, shunt the battery with a large resist- ance r, then if a portion r' (right hand, Fig. 125) of this resistance bears to the whole r, a ratio equal to R, it follows, without our knowing either r or r' in ohms, that V, the P.
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