Answer :
Final answer:
To test AC voltage with a multimeter, set the dial to the AC voltage setting symbolized by a V with a wavy line, and select a range higher than the expected voltage. For example, use the 200V AC setting when testing a household outlet.
Explanation:
When testing AC voltage with a multimeter, it is essential to ensure the multimeter dial is correctly set to prevent damage to the multimeter and to obtain an accurate measurement. To measure AC voltage, you must set the dial to the AC voltage setting, which is usually indicated by a V with a wavy line (~) next to it. The multimeter's AC voltage settings might range from lower voltages like 2V, 20V, up to higher voltages such as 200V or 600V. You should initially select a range that is higher than the expected voltage you are testing to protect the multimeter from overload. For example, if you are testing a standard household outlet which typically has an output of approximately 120 volts or 220 volts depending on your location, you should set the dial to at least the 200V AC setting. If the multimeter has a dial setting for both 300-V full-scale reading and 0.300-V full-scale reading, choose the setting that is appropriate for the voltage level you are testing.
Always remember that if you are switching from measuring voltage to measuring current, you need to change the setting on the multimeter from the voltmeter mode to the ammeter mode that matches the type of current (AC or DC) and expected range, such as a 20.0-A full-scale reading or a 100-mA full-scale reading for amperage. Not changing to the correct mode can disrupt the circuit or damage the multimeter.
