A voltage drop test measures the consumed voltage.

• A. Voltage across the component
• B. Current through the circuit
• C. Resistance of the circuit
• D. Consumed voltage

Answer: (D)

Voltage drop testing focuses on how much of the supply voltage is used by a component while it’s in operation. You measure the voltage at the source and across the component’s terminals; the difference between those two voltages is the voltage the component consumes as it operates. That consumed voltage is what the test is designed to reveal, indicating whether the component is dropping the expected amount of voltage.

This isn’t about measuring current directly—that would require a different instrument or setup (an ammeter). It also doesn’t directly give the circuit’s overall resistance; you’d need both voltage and current data (Ohm’s law) to calculate resistance. So the test targets the voltage that the component uses up, which is the drop across the component, i.e., the consumed voltage.