The etymology from electrode takes us to the English language, more precisely to the word electrode. In the composition of the term appear the prefix electro- (referring to the electricity) and the Greek word hodos (translatable as “road”).
The electrode is called end of an electrical conductor that receives an electrical current from or is transferred to a medium. Electrodes make contact with electrolytes, semiconductors, gases and other non-metallic items.
The electrodes are in electrochemical cells. They may be anodes (positive electrodes, where an oxidation reaction takes place and a loss of electrons occurs) or cathodes (negative electrodes, register a reduction reaction and an electron gain is generated). According to him voltage applied to the cell, an electrode acts as either a cathode or an anode.
The secondary cells are those in which the reaction it can be reversed, as in the case of a rechargeable battery. In the primary cellsOn the other hand, the reaction cannot be reversed, which means that the electrodes do not change their identity (that is, the cathodes and anodes are fixed).
The welding electrodesmeanwhile, they are metal rods that can be coated with different materials. They are usually used to produce an electric arc in the process known as arc welding.
It should be noted that electrodes are also used in muscle electrostimulation. Is technique It consists of using electrodes on the body to cause a contraction of the muscles, since they act in a similar way to the impulses sent by the central nervous system when controlling muscle action. This simulates a physical training, activating the muscle fibers.