What is the function of an ohmmeter?

An ohmmeter is specifically designed to measure the resistance of electrical components and circuits. This device operates by applying a known voltage across the component being tested and measuring the resulting current flow to calculate resistance using Ohm's law (R = V/I). Understanding resistance is crucial in diagnosing circuit faults or determining the functionality of various components like resistors, motors, and other electronic devices.

While other tools such as multimeters can measure voltage and current (which is reflected in the other options), the ohmmeter's primary purpose is strictly to measure resistance. This makes it an essential instrument for tasks such as checking for short circuits, verifying the continuity of wires, and ensuring components are functioning correctly within their specified resistance range.