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OR Switch<^< AND Switch | Course Index | Buffers >^> The operation of a simple OR gate can be illustrated by connecting two switches in parallel and then connecting this arrangement in series with a battery and a lamp. The lamp will operate when either of the two switches (S1 OR S2) are closed. Since each switch can only be in one of the two states (i.e., open or closed) at any given time, the open and closed conditions are mutually exclusive. Furthermore, since a switch cannot exist in any other state than completely open or completely closed (i.e., there is no intermediate or half-open state) the circuit is based on binary or 'two-state' logic.
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