## Quick Reference

The basic switching circuits or gates used in digital computers and other digital electronic devices. The output signal, using a binary notation, is controlled by the logic circuit in accordance with the input system. The three basic logic circuits are the **AND**, **OR**, and **NOT circuits**. The AND circuit gives a binary 1 output if a binary 1 is present on each input circuit; otherwise the output is a binary 0. The OR circuit gives a binary 1 output if a binary 1 is present on at least one input circuit; otherwise the output is binary 0. The NOT circuit inverts the input signal, giving a binary 1 output for a binary 0 input or a 0 output for a 1 input.

Often these basic logic circuits are used in combination, e.g. a **NAND****circuit** consists of NOT + AND circuits. In terms of electronic equipment, logic circuits are now almost exclusively embodied into integrated circuits.

**From:**
logic circuits
in
A Dictionary of Physics »

*Subjects:*
Computing — Physics.

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