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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 equation to the right of the equals sign describes how the voltage changes over time. VP is the amplitude. This describes the maximum voltage that our sine wave can reach in either direction, meaning that our voltage can be +V P volts, -V P volts, or somewhere in between.