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