Which of the following best defines the term "work done per unit charge"?

The term "work done per unit charge" is best defined as voltage. Voltage, also known as electric potential difference, quantifies the energy available to move a charge between two points in an electric field. It is calculated as the work done when moving a unit charge (typically measured in coulombs) from a point of lower electric potential to a point of higher electric potential. This concept is fundamental in understanding how energy is transferred in electrical circuits.

Current, while related, refers to the flow of electric charge and is measured in amperes. It does not account for the energy associated with that charge movement. Power measures the rate at which work is done or energy is transferred over time, which is also distinct from the concept of work done per unit charge. Lastly, capacitance relates to a capacitor's ability to store charge per unit voltage rather than describing the energy per charge directly.