Question Video: Recalling Which Electrical Component Measures Resistance Science

Which of the following is the correct circuit component to measure resistance? [A] Ammeter [B] Voltmeter [C] Ohmmeter

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Video Transcript

Which of the following is the correct circuit component to measure resistance? (A) Ammeter, (B) voltmeter, (C) ohmmeter.

Each one of these three circuit components measures some quantity. To see which of the devices measures resistance, let’s recall what are the units of electrical current, electrical potential difference, and electrical resistance — first the units of current. The standard unit of current is the ampere. The standard unit of potential difference is the volt. And the standard unit of electrical resistance is the ohm.

Ohm, by the way, is the last name of the person who developed a law for electrical resistance. The name of this unit for resistance suggests that the ohmmeter is a device for measuring resistance. This is true. An ammeter measures current, a voltmeter measures potential difference, and an ohmmeter measures resistance. We choose answer option (C).

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