The EMF (Electromotive Force) of a cell is the maximum potential difference between two electrodes of a cell. It is the energy provided by a cell or battery per coulomb of charge passing through it and is measured in volts (V). The EMF of a cell is mainly used to determine whether an electrochemical cell is galvanic or not. The EMF of a cell can be calculated using the Nernst equation by Walther Nernst, which provides the standard cell potential of the cell. The EMF of a cell is independent of the shape of electrodes, the distance between electrodes, and the amount of electrolyte. It depends on the material of electrodes and the electrolyte used in the cell.