Which of the following best describes electrical potential difference?

Electrical potential difference is best described as voltage measurement. Voltage represents the potential energy per unit charge that is available to drive electrons through a circuit. It is an essential concept in understanding how electrical systems operate, as it quantifies the energy available to push electric charge between two points. This measurement is critical for designing and analyzing electrical circuits, ensuring that components receive the proper voltage to function effectively.

The other concepts mentioned are related, but they do not accurately represent the definition of electrical potential difference. Energy usage pertains to the consumption of electrical energy over time, while power supply refers to the source that provides electricity to a circuit. Current definition relates to the flow of electric charge in a circuit, measured in amperes, but it does not describe the potential difference itself. Thus, voltage measurement is the most precise term to encapsulate the meaning of electrical potential difference.