Which electrical component is used to measure resistance in a circuit?

The correct choice is the ohmmeter, which is a specific instrument designed to measure resistance in an electrical circuit. It operates by passing a small current through the component being tested and measuring the voltage drop across it. According to Ohm’s Law (V = IR), the resistance can then be calculated using the current and voltage readings.

An ohmmeter is crucial in troubleshooting electrical systems, as it helps determine whether a component has an appropriate level of resistance, which is essential for proper circuit function. While a multimeter can also measure resistance among other parameters (voltage and current), the primary function of an ohmmeter focuses specifically on resistance measurement. Thus, the distinction of the ohmmeter is that it is tailored specifically for this purpose, ensuring accuracy in measuring resistance levels in various components of a circuit.