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Before reading this page
read the one on LOGIC
GATES.
The OR gate has two or
more inputs and one
output.
The output voltage goes
high only when one or
more input voltages are
high.
In the switch diagram
the lamp lights up when
A OR B (or both) are
operated.
In the truth table Z = 1
when A or B = 1.
The Boolean expression
is A+B = Z which
translated says, A or B
high makes Z high.
The plus sign +
translates as OR.
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