<P> Open - circuit potential is important since the metal with the low open potential will dissolve faster in the electrolyte than the metal with high open circuit potential . </P> <P> The potential difference mentioned in the batteries and cells is usually the open circuit voltage . Open circuit voltage is known as the electromotive force (emf), which is the maximum potential difference when there is no current and the circuit is not closed . </P> <P> To calculate open circuit voltage one can use a method similar to the one below: </P> <P> Consider the circuit: </P>

Relation between open circuit voltage and short circuit current