Ace the 2026 Public Health Sanitarian Exam – Sanitarians Unite for a Healthier Future!

The unit that measures electrical power is the watt. Power in an electrical context is defined as the rate at which electrical energy is transferred by an electric circuit. One watt is equivalent to one joule per second, which reflects the amount of energy consumed or produced in that time frame.

Voltage, while related to electrical power, is a measure of the electrical potential difference between two points and is not a direct measure of power itself. Joules measure energy, meaning that they quantify the work done or energy transferred, but they do not provide a direct measure of power which requires a time component. Ohms measure resistance in an electrical circuit. Each of these units has its specific role in electrical systems, but only the watt is the appropriate measure of power.