Multiple Choice
In a circuit, a resistor has resistance and the current through it is . According to Ohm’s law, how do you calculate the voltage drop across the resistor?
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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
A voltmeter
B
An ohmmeter (or a multimeter set to the resistance mode)
C
A wattmeter
D
An ammeter
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 instruments used in circuits: a voltmeter measures voltage, an ammeter measures current, a wattmeter measures power, and an ohmmeter measures resistance.
Recognize that to directly measure resistance without applying voltage and current manually, an ohmmeter is used, which often comes integrated in a multimeter with a resistance mode symbolized by the Greek letter omega (\(\Omega\)).
Therefore, the correct instrument to measure electrical resistance is an ohmmeter or a multimeter set to the resistance mode.
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