What instrument measures resistance?

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

Answer: (D)

Measuring resistance relies on Ohm’s law, where resistance is found from the relationship between current and voltage. An ohmmeter is built specifically for this task: it provides a small, known current through the component and directly measures the resulting voltage drop to display the resistance. That specialized design makes it the best choice for determining how much resistance a component has.

A voltmeter, by contrast, is used to measure voltage, not resistance, and an ammeter measures current. A multimeter can measure resistance too, but only when you set it to the ohms range; it’s a general-purpose tool rather than a dedicated resistance tester. For an accurate reading, ensure the circuit is powered off and the component is isolated from other paths so parallel resistances don’t skew the result.