What does an ohmmeter measure?

An ohmmeter is a specialized instrument specifically designed to measure resistance in an electrical circuit. The fundamental principle behind its operation is based on Ohm's Law, which states that the resistance of a conductor is equal to the voltage across it divided by the current flowing through it. By applying a known voltage and measuring the resulting current flow, the ohmmeter can accurately calculate the resistance value, usually displayed in ohms.

Measuring resistance is essential for various applications, including checking for continuity in electrical connections, evaluating the integrity of components, and troubleshooting circuit problems. Since the other options involve measurements of voltage, current, and power, which are distinct electrical parameters, understanding that an ohmmeter specifically focuses on resistance helps clarify its unique role in electrical diagnostics.