OR logic is formed by __________.

• A. two normally open switches in parallel
• B. two normally closed switches in series
• C. two normally open switches in series
• D. one normally open and one normally closed switch

Answer: (A)

OR logic means the output is energized if any input is energized. Two normally open switches placed in parallel create two independent paths to the output, so closing either switch provides a path for current. That single-switch activation is enough to turn the output on, which is exactly OR behavior. If the switches were in series, both would have to close to complete the circuit, which is AND behavior. Using normally closed switches or a mix of one normally open and one normally closed doesn’t give a clean, deterministic OR operation. Therefore, the parallel arrangement of two normally open switches best represents OR logic.