Electromotive force (emf) is the energy provided per unit charge by an energy source, such as a battery or generator. It is measured in volts and represents the potential difference that drives current around a circuit.
5 Must Know Facts For Your Next Test
Emf is not a force but a potential difference measured in volts.
In a closed loop, the sum of emf sources equals the sum of voltage drops according to Kirchhoff’s Voltage Law.
Emf sources can be both ideal and real; real sources have internal resistance.
The symbol for emf in equations is usually $\mathcal{E}$ or $E$.
A higher emf means more energy per charge is available to do work in the circuit.