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photo a gate can keep you out or let you into a field in the same way a microscopic logic gate is a barrier in an electronic circuit that can let electricity through or stop it flowing altogether put lots of logic gates together and you make a machine that s capable of basic mathematical reasoning
AND | OR | XOR | NOT | NAND | NOR | XNOR. A logic gate is an elementary building block of a digital circuit. Most logic gates have two inputs and one output. At any given moment, every terminal is in one of the two binary conditions low (0) or high (1), represented by different voltage levels. The logic state of a terminal can, and generally does, change often, as the circuit processes data. In most logic gates, the low state is approximately zero volts (0 V), while the high state is approximately five volts positive (+5 V). There are seven basic logic gates: AND, OR, XOR, NOT, NAND, NOR, and XNOR. The AND gate is so named because, if 0 is called false and 1 is called true, the gate acts in the same way as the logical and operator. The following illustration and table show the circuit symbol and logic combinations for an AND gate.