Which term refers to a source of power?

The term that best refers to a source of power in this context is "cell." A cell is a device that transforms chemical energy into electrical energy, thereby serving as a source of power for various electronic devices and applications. Cells can be found in batteries, which are common power sources for many everyday items ranging from remote controls to electric vehicles.

Energy, while closely related, is a broader concept that refers to the capacity to do work and can exist in various forms such as thermal, kinetic, and potential. Voltage and current are terms related to electrical circuits; voltage represents the potential difference that drives electrical current, while current denotes the flow of electric charge in a circuit. However, neither voltage nor current acts as a direct source of power by themselves—they reflect different aspects of the electrical system rather than being a source like a cell.