Definition of Faraday's Laws

Faraday's Laws

Faraday's laws of electrolysis relate the amount of liberated mass at an electrode to the quantity of electricity passing through the electrode. In an electrolytic cell, metal at an electrode's surface is dissolved into an electrolyte or deposited on an electrode by the application of electricity. Faraday's first law states that the amount of current passed through an electrode is directly proportional to the amount of material liberated from it. Faraday's second law states that the mass of two substances that are liberated from electrodes, given the same applied electrical charge, is proportional to the molecular weights of the two substances. An important industrial application of Faraday's law is electroplating, where a material is coated with a thin metallic layer to prevent corrosion or abrasion.

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