The total voltage drop across the components in a series circuit will equal the source voltage. Which legal rule describes this?

The total voltage drop across the components in a series circuit will equal the source voltage. Which legal rule describes this?

• A. Law for resistance in a series circuit
• B. Law for voltage in a series circuit
• C. Law for current in a series circuit
• D. Law for voltage in a parallel circuit

Answer: (B)

In a closed loop, the voltages must balance to zero overall—this is Kirchhoff's Voltage Law. In a series circuit, the same current flows through every component, and the voltages across those components are drops that add up. The sum of those drops must equal the source voltage, so the total voltage drop across the components matches the supply. That’s why this statement fits the scenario for a series circuit. The other ideas aren’t about summing voltages to the source in a series setup, or pertain to parallel-circuit behavior where each branch sees the source voltage rather than a sum of drops.

In a closed loop, the voltages must balance to zero overall—this is Kirchhoff's Voltage Law. In a series circuit, the same current flows through every component, and the voltages across those components are drops that add up. The sum of those drops must equal the source voltage, so the total voltage drop across the components matches the supply. That’s why this statement fits the scenario for a series circuit. The other ideas aren’t about summing voltages to the source in a series setup, or pertain to parallel-circuit behavior where each branch sees the source voltage rather than a sum of drops.