How does an ohmmeter function in automotive diagnostics?

An ohmmeter is a tool specifically designed to measure electrical resistance in circuits or components. It operates by applying a small voltage through the component or portion of the circuit being tested and then measuring the resulting current flow. The relationship between voltage, current, and resistance is defined by Ohm's Law, allowing the ohmmeter to calculate the resistance value accurately.

In automotive diagnostics, measuring resistance is crucial for assessing the health of various electrical components such as sensors, motors, and wiring. For example, a high resistance reading in a wiring harness can indicate a corroded connection or a break in the wire, while a lower than expected resistance could signify a short circuit or a failing component.

Understanding how to interpret resistance measurements helps technicians diagnose issues within the electrical system, making it an essential function of an ohmmeter in the automotive field.