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The responses I have seen so far address input and output as common English
words. However, within the Electrical Engineering and electronics field,
they have very precise meaning. The nouns are not collectives within these
An AND gate has 2 or more inputs and one output. Each input is distinct. In
this case, a single input is one wire feeding an electric current into the
gate. The gate has one exit path for the current, the output.
Thus, for an AND gate, you would write:
When both inputs are high, the output is high. When one input is high and
the other is low, the output is low. When both inputs are low, the output is
Know your audience and choose the appropriate language for that audience.
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