Multiple Choice
In the context of Ohm's law, what SI unit is used to measure electrical resistance?
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27. Resistors & DC Circuits
Resistors and Ohm's Law
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In basic circuit measurements related to resistors and Ohm’s law, which instrument is used to measure electrical resistance?
A
Ammeter
B
Voltmeter
C
Oscilloscope
D
Ohmmeter (or a multimeter set to the resistance/ohms mode)
Verified step by step guidance1
Understand that electrical resistance is a measure of how much a component opposes the flow of electric current.
Recall that Ohm's law relates voltage (V), current (I), and resistance (R) through the formula \(R = \frac{V}{I}\).
Identify the instrument designed specifically to measure resistance directly, which is called an ohmmeter.
Recognize that a multimeter can also measure resistance when set to the resistance (ohms) mode, functioning as an ohmmeter.
Note that other instruments like ammeters measure current, voltmeters measure voltage, and oscilloscopes display voltage signals over time, but none directly measure resistance.
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