III. The samequantity of electricity--that is the same current for the same period----- decomposes chemically equivalent quantities of the bodies it decomposes, or the weights of elements separated in electrolytes by the samequantity of electricity (in coulombs or some equivalent unit) are to each other as their chemical equivalent.
IV. The quantity of a body decomposed in a given time is proportional to the strength of the current.
To these may be added the following:
V. A definite and fixed electro-motive force is required for the decomposition of each compound, greater for some and less for others. Without sufficient electro-motive force expended on the molecule no decomposition will take place. (See Current, Convective.)