Question

What within the cell produces potential difference in its terminals?

Answer 1

Hello dear...............



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.

Answer 2

Whatever be the case, the battery produces a potential difference across its two terminals. This is known as the terminal potential difference(V). It is different from the E.M.F. of the cell(E), in that it accounts for a minute loss of potential across the internal resistance of the cell(r).