Define emf and the potential difference.
An electric quantity that explains the variation of electric charge per unit time identified as electric current. Its measurable is Ampere. The movement of the electron causes the movement of current in the circuit.
Answer and Explanation:
An electric quantity that describes the work done furnished by a cell or battery per charge of electric move through it is known as emf. Its measurable unit is volt (V). It is equal to the variation in potential over the ends of the cell when no current is drawn.
An electric quantity that explains the voltage developed within the two-terminals of the electrical circuit is known as a potential difference. Its measures in the electric unit are Volt. It produces by the movement of the electric current connecting the two terminals.
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from Physics: High SchoolChapter 16 / Lesson 2