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Cell voltage. The standard electrical potential of a cell can be determined by the use of a standard potential table for the two half cells involved. The first step is to identify the two metals reacting in the cell. Then one looks up the standard electrode potential, E0, in volts, for each of the two half reactions.
The maximum emf of a galvanic cell is called the cell potential, Ecell. It is measured with a device that draws negligible current during the experiment. Ecell depends on the composition of the electrodes and the concentrations of the ions in each of the half-cells.n a competition for electrons, the half-reaction having the higher (more positivie) reduction potential undergoes reduction. The half-reaction with the lower reduction potential is therfore forced to undergo oxidation.