What is defined as electromotive force?

Electromotive force (EMF) is defined as voltage, which is the electrical potential difference that drives current through a circuit. It represents the amount of energy provided by a power source per unit charge as it moves through the system. Essentially, voltage is the force that pushes electrons along a conductor, enabling the flow of current.

Understanding voltage as EMF is fundamental in electrical theory, as it is necessary for calculating the behavior of electrical circuits. In contrast, current refers specifically to the flow of electric charge, resistance measures the opposition to that flow, and power is the rate at which energy is transferred or used in the circuit. Each of these terms plays a different role in electrical systems, but voltage is the key concept that directly relates to electromotive force.