An ohmmeter is used to measure what?

An ohmmeter is a specialized instrument used to measure electrical resistance, which is expressed in ohms. Resistance indicates how much a material opposes the flow of electric current. This measurement is crucial for diagnosing circuits and determining whether components are functioning correctly.

Ohmmeters can be found as standalone devices or as part of multimeters, which can also measure voltage and current. When using an ohmmeter, it provides a direct reading of resistance, allowing technicians and engineers to assess the integrity of connections and the performance of resistive components in an electrical circuit.

The other choices relate to different measurements: Hertz pertains to frequency, which is a measure of cycles per second; electrical resistance is specific to the function of an ohmmeter; and temperature is measured in degrees Celsius or Fahrenheit, which is outside the scope of an ohmmeter's function. Understanding the specific role of an ohmmeter helps recognize its importance in maintaining and troubleshooting electrical systems.