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Computing Academy GCSE Computer Science

Logic Gates In 1854 a

Logic Gates In 1854 a British mathematician, George Boole, developed Boolean Algebra. Instead of an algebra that uses numbers, boolean algebra uses truth values, true (1) and false (0). We know that the very foundation of computing systems is based upon binary, 1 and 0, on or off. The ALU (part of the CPU) performs simple logical calculations by evaluating the sequences of 1s and 0s. The relationship between input and output can be illustrated using a truth table. In truth tables we use algebraic values such as A, B, C for inputs and P, Q and R for outputs 149

NOT A NOT gate inverts the input so if A (the input) is equal to 1 then P (the output) will be 0. A P 0 1 1 0 150

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