Which statement best describes a series circuit?

• A. Current can flow in only one path.
• B. Two or more devices are connected across the same source of electrical power.
• C. Voltage remains the same across all components.
• D. There is always zero resistance.

Answer: (A)

In a series circuit there is a single path for current to flow from the power source through all components and back. Because there’s only one path, the same current passes through every component in the loop—the charge has nowhere else to go. The voltage from the source is divided among the components rather than remaining the same across each one, and the total resistance is the sum of the individual resistances. If any part of the loop opens, the entire circuit stops conducting. This single-path behavior is what the statement captures best.