A(n) __________ electrical circuit provides a path for current to flow between the positive and negative terminals of a power supply.

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

Answer: (B)

Providing a complete conducting path between the positive and negative terminals is what makes a circuit capable of current flow. When the loop is closed, electrons can travel from the power source, through any loads, and back to the other terminal, allowing operation. If there’s a break anywhere in the loop, the path is interrupted, and no current can flow—this is an open circuit.

Series and parallel describe how components are arranged, but they don’t by themselves guarantee a path for current. A circuit can be closed or open regardless of whether components are in series or in parallel. The essential condition for current to flow is a continuous, closed path, so the correct term is a closed circuit. An open circuit lacks that continuous path, so it cannot conduct.