Page:Scientific Memoirs, Vol. 2 (1841).djvu/490

478 situated between two points of excitation, we then very simply obtain where $$L$$ denotes the entire reduced length of the circuit, and $$A$$ the sum of all its tensions. By means of this equation we obtain the magnitude of the electric current of a galvanic circuit, composed of any number of prismatic parts, which has acquired its permanent state, which is not affected by the surrounding atmosphere, and the single sections of which possess in all their points one and the same electroscopic force; in this category are comprised the most frequently occurring cases, on which account we shall dissect this result in the most careful manner. Since $$A$$ represents the sum of all the tensions in the circuit, and $$L$$ the sum of the reduced lengths of all the individual parts, there results, in the first place, from the equation found, the following general properties relative to the electric current of the galvanic circuit.