Definition
In digital electronics, the higher of the two voltage levels used to represent binary information. In a positive-logic system, Logic One corresponds to the binary digit 1 and is typically represented by the more positive voltage (for example, +5 volts), while Logic Zero corresponds to the less positive or ground-level voltage.
Plain English
One of the two states a digital circuit uses to carry information. Logic One is the 'on' or 'high' state — the voltage level the circuit reads as a 1.
Context Anchor
Seen in avionics, aircraft electrical system descriptions, and troubleshooting information for equipment that uses digital signals.
Derivation
From the use of binary logic in digital systems, where every signal is either a 1 or a 0. 'Logic One' simply names the state that represents the digit 1.
Why Pilots Care
Allows maintenance personnel to correctly interpret signals in logic-based aircraft components.
Analogy
Think of a yes/no question. Logic One is the “yes” answer, but each piece of equipment decides what electrical signal counts as “yes.”
Intuition Check
Logic One does not mean “the first logic” or simply “good reasoning.” It means the 1 state of a two-state electronic signal.
Example Sentence 1
When the switch closed, the input line went to Logic One and the indicator illuminated.
Example Sentence 2
When the sensor detects the condition, the circuit outputs logic one to the computer.