Is EMF a voltage?
The electromotive force (emf) is the potential difference of a source when no current is flowing. Terminal voltage is the voltage output of a device is measured across its terminals. Terminal voltage is calculated by V = emf – Ir.
Why EMF is called force?
No, it's just the potential difference between the terminals of a battery. It got its name because people thought that a force was moving the electrons. … The quantity which was thought to refer to EMF turned out to be potential difference.