The key in applying this information to electrochemical systems is the Faraday constant: 96,500 C/mol e^- (F). This proportionality connects the amount of charge to a definite number of electrons. Since each half-reaction gives the ratio of electrons to a particular substance, stoichiometric relationships can then be worked out from current and time measurements.

In fact, some of the early determinations of Avogadro's number were done in this way. Once reasonably accurate relative atomic masses were known a simple plating cell could be used to find the relationship between current and time (therefore charge--or the number of electrons) and the amount of metal plated or dissolved.

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