Answer :
Final answer:
To test for AC voltage, the multimeter's rotary dial should be set to the AC voltage setting, typically denoted by a 'V~' symbol. The setting scale should match or exceed the expected voltage. The meter displays the RMS value of the fluctuating AC voltage.
Explanation:
When testing for AC voltage, the rotary dial on a multimeter is usually set to the AC voltage setting, which is often represented with a V~ symbol. The scale of the AC voltage setting is necessary to choose in order to match or exceed the expected voltage. For example, if we suspect that an AC voltage could be about 120 volts (a common value for household outlets in the United States), we would choose a multimeter setting of 200 volts AC. Keep in mind that this AC voltage setting may vary depending on where in the world you are and what the expected voltage is (example, 220 V AC in Europe).
An important concept here is that the voltmeter used will display the rms value. RMS stands for root-mean-square, and it's a way of finding an equivalent value for AC voltages because they fluctuate sinusoidally. So for example, a standard household outlet in the US is referred to as 120 V AC, which means the Vrms is 120 V.
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