When inserting the test leads into the meter for AC voltage measurements, where should the black lead be inserted?

For AC voltage measurements, the black lead should be inserted into the COM (common) terminal of the multimeter. The COM terminal serves as the reference point for all measurements. In most multimeters, this is the ground lead and is essential for ensuring accurate readings.

When measuring AC voltage, the black lead is connected to the COM to complete the circuit and provide a stable reference point for the meter. This is important because any electrical measurement needs a return path to the common reference to yield an accurate result.

Other terminals such as the A (amperage) or mA (milliamperage) lead are specifically for current measurements, while the V Ω Hz terminal is primarily used for measuring voltage (V), resistance (Ω), or frequency (Hz). Using the appropriate lead in the correct terminal according to the measurement type is vital for both safety and accuracy when working with electrical measurements.