Figure 1: Do you consider the depicted situation real or fictive?
The electrochemical cell is the basic element of the electrochemical sources of electric energy. It is used for supply of portable devices as e.g. calculators, electric torches, watches, radios, cell phones, notebooks, etc. Big electrochemical cells, composed of several electrochemical cells (batteries), may start and even power the car or electric bicycle. Electric energy is the result of the transformation of chemical energy of substances, reacting in the cell – both electrodes and electrolytes. Primary electrochemical cells (galvanic cells) may supply electric energy only several hours or days, because the chemicals react and exhaust themselves. The electrochemical cells susceptible to charging are called secondary electrochemical cells.