NOT logic is formed by __________.

NOT logic, also known as negation, is a fundamental concept in digital logic design where the output is the inverse of the input. In the case of a NOT gate, when the input is in a "high" state (logic 1), the output will be in a "low" state (logic 0), and vice versa.

For NOT logic to be effectively implemented, it typically involves a single input scenario that is inverted. The use of one normally closed input switch directly aligns with this concept because when the normally closed switch is closed (input is in a high state), the circuit provides a low output. Conversely, if the switch is opened (input is in a low state), the result would be a high output. This behavior perfectly illustrates the inversion characteristic of NOT logic.

In contrast, combinations of normally open switches would generate different output behaviors, as they typically require both switches to be closed for any output change, instead of simply inverting a single input signal. Thus, the choice of one normally closed input switch aligns directly with the defining properties of NOT logic.