Electromotive Force (EMF) Explanation:
EMF is the potential difference between the terminals of a source of electrical energy. It is not a force in the traditional sense but rather a measure of the energy provided by a source to move charge through a circuit.

Definition:
EMF can be defined as the amount of energy provided by a source to move a unit positive charge through a complete circuit.

Units:
The unit of EMF is volt (V) in the International System of Units (SI).

Characteristics:
- EMF is a scalar quantity.
- It is always greater than the potential difference across the terminals when a current is flowing through a circuit.
- EMF is responsible for the flow of current in a circuit.

Example:
Consider a simple circuit with a battery. The EMF of the battery is the maximum potential difference between its terminals when no current is flowing. When a current flows, the potential difference across the terminals will be slightly less than the EMF due to internal resistance within the battery.

Significance:
EMF is crucial in understanding the behavior of electrical circuits and devices. It provides the driving force for the flow of current in a circuit and determines the amount of work done on the charge carriers.
In conclusion, electromotive force is the potential difference or voltage provided by a source of electrical energy to move charge through a circuit. It is not a force in the traditional sense but a measure of energy that drives the flow of current.