15.
(Continued)
On page 1-7, the truth table indicates that only one combination of switch settings turns on
the light; thus, if, and only if, all switches have a truth value of 1, there is an output. This
is known as the AND function, because switch A and switch B and switch C must all be
closed to produce an output. The Boolean expression for this condition is ABC (read A
and B and C). The logic of an AND function is stated: If, and
if,
all conditions are
, the result will be
.
only
16.
The OR function of Boolean algebra is stated: If any condition or all conditions are true,
true
the result is true. The OR logic is represented by the parallel switching network shown
true
below.
1-9
IT0342
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