A device that measures the amount of resistance that interferes with the flow.

A device that measures the amount of resistance that interferes with the flow.

• A. Ammeter
• B. Voltmeter
• C. Multimeter
• D. Ohmmeter

Answer: (D)

Understanding how resistance affects current flow helps here. Resistance is what slows down or opposes the movement of charges in a path. An ohmmeter is built specifically to quantify that opposition in ohms. It works by injecting a small, known current into the component and measuring the resulting voltage, or by applying a known voltage and measuring the current, then calculating R = V/I. The number you get tells you how much the path resists current, which is exactly what you’re trying to assess. Ammeter measures current itself, not resistance; voltmeter measures voltage, not resistance; and a multimeter can measure resistance but is a general tool for multiple readings, whereas the device described is defined by measuring resistance directly. For accurate readings, make sure the circuit is de-energized before measuring resistance.

Understanding how resistance affects current flow helps here. Resistance is what slows down or opposes the movement of charges in a path. An ohmmeter is built specifically to quantify that opposition in ohms. It works by injecting a small, known current into the component and measuring the resulting voltage, or by applying a known voltage and measuring the current, then calculating R = V/I. The number you get tells you how much the path resists current, which is exactly what you’re trying to assess.

Ammeter measures current itself, not resistance; voltmeter measures voltage, not resistance; and a multimeter can measure resistance but is a general tool for multiple readings, whereas the device described is defined by measuring resistance directly. For accurate readings, make sure the circuit is de-energized before measuring resistance.