Discussion
Which gate is known as the ‘inverter’?
Answer: C
Correct answer: NOT
The NOT gate is the inverter. It has a single input and a single output, and the output is always the complement of the input: 0 becomes 1 and 1 becomes 0. Its Boolean expression is \( Y = \bar{A} \). On a circuit diagram it is drawn as a triangle with a small circle, or bubble, at its output. That bubble is the general symbol for inversion, which is why a NAND gate is drawn as an AND gate with a bubble and a NOR gate as an OR gate with one. The NOT gate is the only basic gate with one input; AND, OR, NAND, NOR and XOR all take two or more. It is easily built from a universal gate: tying both inputs of a NAND or a NOR together produces an inverter, which is part of what makes those gates universal. Two inverters in series cancel, giving \( \bar{\bar{A}} = A \) - the involution law of Boolean algebra.
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