... driving circuit. Mnemonics: LEO Red Cat (Loss of Electrons is Oxidation, Reduction occurs at the Cathode), or AnOx ... Oxidation, Reduction Cathode), or OIL RIG (Oxidation is Loss, Reduction is Gain of electrons), or Roman Catholic and Orthodox (Reduction ... GER (Losing electrons is Oxidation, Gaining electrons is Reduction)This process is widely used in metals refining. For example, in copper refining, ...