# What are Logic Gates? State De-Morgan’s Law of Boolean Algebra.?

Can some one briefly explain the concept of Logic Gate. Also Stater the De-Morgans Law in Boolean Algebra?

02-11-2012

05-11-2012
"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 output is ""true"" when both inputs are ""true."" Otherwise, the output is ""false."" The OR gate gets its name from the fact that it behaves after the fashion of the logical inclusive ""or."" The output is ""true"" if either or both of the inputs are ""true."" If both inputs are ""false,"" then the output is ""false."" The XOR (exclusive-OR) gate acts in the same way as the logical ""either/or."" The output is ""true"" if either, but not both, of the inputs are ""true."" The output is ""false"" if both inputs are ""false"" or if both inputs are ""true."" Another way of looking at this circuit is to observe that the output is 1 if the inputs are different, but 0 if the inputs are the same. A logical inverter, sometimes called a NOT gate to differentiate it from other types of electronic inverter devices, has only one input. It reverses the logic state. The NAND gate operates as an AND gate followed by a NOT gate. It acts in the manner of the logical operation ""and"" followed by negation. The output is ""false"" if both inputs are ""true."" Otherwise, the output is ""true."" The NOR gate is a combination OR gate followed by an inverter. Its output is ""true"" if both inputs are ""false."" Otherwise, the output is ""false."" The XNOR (exclusive-NOR) gate is a combination XOR gate followed by an inverter. Its output is ""true"" if the inputs are the same, and ""false"" if the inputs are different. Source: http://in.docsity.com/en-docs/Fundamentals_of_Information_Technology__Lecture_Notes__Elveera_Miranda"
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28-01-2013
A gate is definitely an idealised or bodily device utilizing the Boolean purpose, which is, the idea does a logical surgery one or even more judgement advices in addition to creates a individual logical system end result. According to the wording, the word whitethorn make reference to a great logic gate, the one which possesses in particular actually zero rise time and endless enthusiast-available, or it might consider A not for-suitable actual device.
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