When checking voltage in a circuit, the meter should be connected:

• A. In Series
• B. In Parallel
• C. Open Circuit
• D. Closed Circuit

Answer: (B)

The key idea is to measure potential difference without disturbing the circuit. A voltmeter is designed with very high input resistance, so it draws almost no current. By connecting it in parallel with the component or section of the circuit you want to measure, it directly reads the voltage across that part while leaving the circuit operation essentially unchanged. If you hooked it up in series, the meter would become part of the current path and could alter currents and voltages, giving incorrect readings or affecting the circuit. An open circuit would break the circuit and prevent a proper measurement, while a closed circuit isn’t about how you connect the meter. So the correct approach is to connect the voltmeter in parallel.