In the truth table of a NOT gate, what is the output when the input is 0?

The output of a NOT gate is determined by its fundamental operation, which is to invert the input signal. A NOT gate has only one input and one output. When the input is 0, the NOT gate inverts this value, resulting in an output of 1. This behavior is consistent with the definition of a NOT gate in digital logic, where it performs the operation of negation.

Since the NOT gate only outputs one specific value for each possible input, it is not possible for it to output both values simultaneously or to provide an undefined output. The output is clearly defined as inversely corresponding to the input value, ensuring clarity in its operational characteristics. Thus, when the input is 0, the output must be 1.