What unit is used to measure electrical energy?

The unit used to measure electrical energy is the Joule. In the context of electricity, energy is represented as the work done when an electric charge moves through an electric potential difference. Specifically, one Joule can be defined as the energy transferred when one coulomb of charge moves through a potential difference of one volt.

Joules are a measure of energy in general, applicable across various scientific disciplines, not limited to electricity. This makes Joules a fundamental unit when discussing energy in electrical systems, as they allow for the quantification of energy used, transferred, or converted.

In contrast, other choices represent different electrical quantities: Watts measure power (the rate at which energy is used or generated), Volts measure electric potential difference, and Ohms measure resistance in an electrical circuit. Each of these units plays a critical role in the field of electricity but serves a distinct purpose that does not equate to measuring electrical energy directly.