OR logic is formed by __________.

OR logic is characterized by the logical operation that will yield a true output if at least one of the input conditions is true. In terms of switch configurations, this is effectively represented by using normally open input switches in parallel.

When two normally open switches are placed in parallel, either switch can close the circuit, allowing electrical current to flow and completing the circuit. This configuration ensures that even if only one switch is closed, the output remains true, fulfilling the requirement of OR logic.

In contrast, using normally closed switches in series would mean that both switches need to be off (open) to maintain the flow of current, which does not support the operational premise of OR logic. Similarly, using normally closed switches in parallel leads to scenarios where the circuit can only be completed when both switches are open, further misaligning with how OR logic operates.

Therefore, the combination of two normally open input switches in parallel is the definitive representation of OR logic, since it successfully models the notion of achieving a true state from either input without needing both to activate the output.