Discussion
In a NOT gate, the output is always the complement of the input.
Answer: B
Correct answer: True
The statement is true. The NOT gate, or inverter, has a single input and produces its complement: 0 becomes 1 and 1 becomes 0. Its Boolean expression is \( Y = \bar{A} \). It is the only basic gate with one input; every other takes two or more. On a diagram it is drawn as a triangle with a small circle at the output, and that circle - the bubble - is the general symbol for inversion, which is why NAND is drawn as AND with a bubble and NOR as OR with one. Two inverters in series cancel, giving \( \bar{\bar{A}} = A \), which is the involution law of Boolean algebra. Pairs of inverters are nevertheless used deliberately as buffers, to restore signal strength without changing the logic. An inverter is easily made from either universal gate by tying the inputs together: a NAND or a NOR with both inputs joined behaves exactly as a NOT.
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