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Subject - Electrochemistry

The electric cell refers to a set of electrodes which provide electrical energy by electrochemical reactions. The electrodes (positive electrode = anode, negative electrode = cathode) are separated by a liquid, paste-like or ion-transporting electrolyte. Each electrode has a characteristic electrochemical potential. During the reaction one electrode reacts by giving up electrons (anodic oxidation) while the other takes up electrons (cationic reduction. If both electrodes are connected by an electrical conductor (wire), an electrical current flows between them because of the potential gradient (see Fig.1).


See also: galvanic cell