Dictionary
Potential Difference
A potential difference between two points gives rise to a "force" called an electromotive force or emf that tends to push electrons or other charge-carriers from one point to the other. A potential difference is generated between the ends of an electrical conductor that moves perpendicular to a magnetic field. Between two points in an electrical circuit the potential difference is equal to the difference in their electrical potentials.
The potential difference is defined as the amount of work per charge needed to move electric charge from the second point to the first, or equivalently, the amount of work that unit charge flowing from the first point to the second can perform.
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