electromotive force (emf)

Electromotive force (emf) is the electrical potential difference generated by a source, like a battery or generator, that drives electric current through a circuit. It represents the energy per unit charge provided to move electrons from one point to another, overcoming resistances within the circuit. Although called "force," emf is actually measured in volts and indicates how much energy the source supplies to push charges around. It's the initial "push" that causes current to flow, enabling devices like lights, motors, and electronics to operate.