Insert the information in the form and the calculator will determine the electromotive force of a cell.

What is the electromotive force of a cell?

The electromotive force of a cell (EMF) is the maximum potential difference between two electrodes of a cell. In simple words it is the net voltage between the oxidation and reduction half reactions.

How to calculate electromotive force of a cell?

To calculate electromotive force of a cell you should use the following formula:
ε = v + I * r
where:
ε = electromotive force
I = current
v = voltage
r = internal resistance of a cell

example: A circuit that has a potential difference of 4.6v, with a current of 1A and the internal resistance of the battery is 0.8 ohms. calculate the cell EMF?

Using the electromotive force of a cell formula the answer will be:
:
ε = v + I * r
ε = 4.6 + 1 * 0.8
ε = 5.4v

Why use electromotive force of a cell?

The electromotive force of a cell (EMF) is used in order to determine whether an electrochemical cell is galvanic or not.