When testing a "live" 120-volt receptacle using a voltage tester, you should get a 120-volt reading when measuring from the ungrounded conductor connection (short slot) to the grounding conductor connection (U-shaped slot).

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When testing a live 120-volt receptacle, you should get a 120-volt reading when measuring from the ungrounded conductor connection (short slot) to the grounding conductor connection (U-shaped slot). This is because the grounding conductor is connected to the earth and provides a path for any electrical faults or surges to be safely discharged.

When Testing a "Live" 120-Volt Receptacle Using a Voltage Tester