An instrument used to measure resistance in an electrical circuit is a(n)

An instrument used to measure resistance in an electrical circuit is a(n)

• A. Ammeter.
• B. Ohmmeter.
• C. Mega meter.
• D. Voltage tester.

Answer: (B)

The correct choice is an ohmmeter, which is specifically designed to measure electrical resistance in a circuit. Resistance is measured in ohms, which is why the instrument bears the name that reflects its purpose. The ohmmeter works by sending a small, known current through the component and measuring the voltage drop across it, allowing for the calculation of resistance according to Ohm's Law. An ammeter measures the current flowing through a circuit, while a voltage tester is used to check the presence of voltage in an electrical circuit but does not measure resistance. A mega meter, or insulation tester, is designed to measure the resistance of insulating materials, but it typically operates at much higher voltages and is used for testing insulation rather than general resistance measurement. Therefore, the ohmmeter is the most appropriate instrument for measuring resistance in an electrical circuit.

The correct choice is an ohmmeter, which is specifically designed to measure electrical resistance in a circuit. Resistance is measured in ohms, which is why the instrument bears the name that reflects its purpose. The ohmmeter works by sending a small, known current through the component and measuring the voltage drop across it, allowing for the calculation of resistance according to Ohm's Law.

An ammeter measures the current flowing through a circuit, while a voltage tester is used to check the presence of voltage in an electrical circuit but does not measure resistance. A mega meter, or insulation tester, is designed to measure the resistance of insulating materials, but it typically operates at much higher voltages and is used for testing insulation rather than general resistance measurement. Therefore, the ohmmeter is the most appropriate instrument for measuring resistance in an electrical circuit.