What instrument measures resistance?

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.

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.