According to Ohm's law, electric current is directly proportional to voltage across two points and inversely proportional to resistance. Ohm's law, which gives the relationship between the voltage and the current by taking into account the resistance value, is crucial to understanding how electric circuits work.

Therefore, from Ohm's law we know that, which implies that taking R as the proportionality constant and is known as resistance. When there is no current flowing through the cell, the potential difference across its terminals is what creates electromotive force. When no current is flowing, electromotive force (EMF) equals the terminal potential difference.

Despite the fact that both EMF and terminal potential difference (V) are expressed in volts, they cannot be considered as the same physical quantity. EMF is the quantity of energy (E) that the battery supplies to each coulomb of charge (Q) that passes through. In the given question the potential difference applied is E that is, the given electromotive force. Therefore, .