EMF, electrons, rate

[canadianofpeace]

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"The voltage or electromotive force created by a redox reaction depends on the number of electrons exchanged in the reaction and the rate at which the reaction takes place"

Could someone help me understand this relationship? Is there an equation?

 

[gettheleadout]

The Nernst equation is what you're looking for here:

Note that the cell potential (E_cell) is given in units of Volts and is equal to the emf produced by the reaction. The number of electrons exchanged is accounted for by the "n" term, which represents moles of electrons that flow per complete reaction. The rate of the reaction is accounted for indirectly by the inclusion of the temperature (T) and reaction quotient (Q) terms.