Electrical Mechanic Technician Practice Test

The instrument used to accurately measure the resistance of a resistor, such as one with a value of 47,000 ohms, is an ohmmeter. An ohmmeter is specifically designed to measure the resistance in ohms and provides a direct reading of the resistor's value without the need for additional calculations or measurements of voltage or current.

When you connect the leads of an ohmmeter across the resistor, it applies a small voltage to the resistor and measures the resulting current flow. By using Ohm's Law (V = IR), the ohmmeter can accurately calculate and display the resistance. This precision makes it the most suitable tool for measuring resistance in various electrical applications.

While a multimeter can also measure resistance and might be considered as a potential option, it operates as a more versatile device that can measure voltage and current in addition to resistance. However, if the requirement is strictly for measuring resistance, an ohmmeter is the specialized tool best suited for this task.

Voltameters and ammeters serve different purposes; voltmeters measure voltage and ammeters measure current, neither of which would provide a resistance measurement directly. Thus, for measuring the resistance of a resistor like a 47,000 ohm unit, the oh