2. Faraday's Law

Equation (1) shows that each nickel ion, in order to deposit as a nickel atom, accepts two electrons at the cathode surface. Therefore, 1000 nickel ions require 2000 electrons, 1 million nickel ions require 2 million electrons, etc. In other words, the amount of nickel deposited is in direct proportion to the current that flows through the anode-cathode circuit. This relationship was enunciated in 1833 by Michael Faraday as one of two basic laws of electrolysis. These laws, incidentally, were the first quantitative demonstration of the electrical nature of matter and have long defined the unit quantity of electricity.