To measure AC or DC current, turn circuit power ______ to connect the meter.

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Multiple Choice

To measure AC or DC current, turn circuit power ______ to connect the meter.

Explanation:
Measuring current requires placing the meter in series with the circuit. The ammeter input is a very low-resistance path, so if you connect it while the circuit is powered, you risk creating a short, damaging the meter or components, and exposing yourself to shock. Turning the power off first lets you safely break the circuit and insert the meter in series. Once it’s in place, you can restore power and read the current flowing through that path. The other states don’t fit because they don’t ensure the circuit is safely de-energized before connection.

Measuring current requires placing the meter in series with the circuit. The ammeter input is a very low-resistance path, so if you connect it while the circuit is powered, you risk creating a short, damaging the meter or components, and exposing yourself to shock. Turning the power off first lets you safely break the circuit and insert the meter in series. Once it’s in place, you can restore power and read the current flowing through that path. The other states don’t fit because they don’t ensure the circuit is safely de-energized before connection.

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