Which tool is used to measure resistance in electrical circuits?

The tool used to measure resistance in electrical circuits is the ohmmeter. This instrument is specifically designed to assess the resistance of components or devices in ohms. It operates by sending a small current through the component being tested and measuring the voltage drop across it, which allows for calculating the resistance based on Ohm's Law (V = IR).

Other tools listed serve different purposes:

• A clamp-on ammeter is used for measuring electric current without the need to disconnect the circuit; it measures the current flowing in a conductor via electromagnetic induction.

• A phase sequence indicator is employed to determine the phase rotation of three-phase systems, which is important for ensuring proper operation of three-phase motors.

• A voltmeter measures the electrical potential difference (voltage) between two points in a circuit but does not directly measure resistance.

Understanding the specific purpose of each tool helps clarify why the ohmmeter is the correct choice for measuring resistance.