Electromotive force is the electric potential produced either by an electrochemical cell or by changing the magnetic field.
Differences between Electro-Motive Force(EMF) and Potential Difference
The differences between EMF and Potential Differences are as tabulated below –
| Electromotive Force (EMF) | Potential Difference |
|---|---|
| EMF is the potential difference between two electrodes of a battery or a cell in an open circuit. | Potential Difference is the difference of potential between any 2 points of a closed circuit. |
| Electromotive Force is always greater than the potential difference between two points of a conductor. | The potential difference is always less than EMF. |
| EMF Formula: E = I * (R + r). | Potential Difference Formula: V = I * R. |
| EMF is caused by an electric, gravitational, or magnetic field. | Voltage is produced only in the electric field. |
| EMF is independent of resistance. | Potential Difference is dependent on resistance. |
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