During a hipot test, the current that flows ____ of the high voltage supply is measured.

• A. In
• B. Across
• C. Out
• D. Through

Answer: (C)

Hipot testing looks at insulation by applying a high voltage and watching how much current leaks through any insulation paths. The important thing is the current drawn from the high-voltage source—the amount that flows out of the HV supply into the device under test and returns through the circuit. That leakage current tells us how well the insulation is working at the applied voltage. So the best description is the current that flows out of the high-voltage supply is measured.

Saying it flows into the supply would imply the opposite direction. Describing current as flowing “across” isn’t how we talk about current direction in this context, since voltage is across components while current is the flow path. And while current does pass through the DUT, the measurement is about what the HV source delivers, not about current passing through the supply itself.