Which tool is used to verify voltage in a circuit?

• A. Multimeter
• B. Hydrometer
• C. Soldering iron
• D. Torque wrench

Answer: (A)

Verifying voltage in a circuit means measuring the electrical potential difference between two points. A multimeter is designed for this exact purpose, offering a voltage measurement function (digital or analog) in DC and AC ranges.

When you test, set the meter to the correct voltage range for the circuit, connect the red probe to the point you want to test and the black probe to a reference point such as ground, and read the voltage value. In automotive or low-voltage circuits, you’ll usually be measuring DC voltage, like a 12-volt system. For example, a healthy car battery shows about 12.6 volts with the engine off, and the charging voltage is typically around 13.8 to 14.8 volts when the engine is running.

Other tools listed serve different tasks: a hydrometer measures liquid density, a soldering iron melts solder for joints, and a torque wrench tightens fasteners to a specific specification. Using the multimeter for voltage verification provides accurate, direct readings of electrical potential without altering the circuit.