Parallel circuits are used because they are ______ reliable.

• A. Not reliable
• B. Very reliable
• C. Moderately reliable
• D. Unstable

Answer: (B)

Reliability in a parallel circuit comes from each load having its own path to the power source. If one path fails or a branch opens, the others still have a complete circuit, so they stay powered. The voltage across every branch remains the same, so each device operates normally regardless of what happens in other branches. This built-in redundancy makes the overall system very reliable, especially compared with a series arrangement where a single failure can cut power to every load.