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Before reading this page
read the one on LOGIC
GATES.
The NOR gate has two or
more inputs and one
output.
The output voltage goes
low only when one or
more input voltages are
high.
In
the switch diagram the
lamp goes out when A
OR
B (or both) are
operated. (A short
circuit is placed across
the lamp)
In the truth table Z =
0 when A or B = 1
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The Boolean expression
is A+B = Z which
translated says, A or B
high makes Z low.
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The plus sign, +
translates as OR. Z
(called Z bar) means Z
is low.
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