2.4 - Boolean Logic
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Describe the purpose of a ‘Truth Table’.
To show all possible combinations of inputs to a logic circuit and the corresponding output for each combination.
How many rows are in a truth table with 3 inputs?
Eight rows, because 2 to the power of 3 equals 8.
Draw or describe the symbol and logic result for an ‘AND’ gate (Conjunction).
The symbol is a D-shaped gate with no circle. The output is 1 (True) only when both inputs are 1; otherwise, the output is 0.
Draw or describe the symbol and logic result for an ‘OR’ gate (Disjunction).
The symbol is a curved, pointed shape with no circle. The output is 1 (True) if either or both inputs are 1.
Describe the features of a ‘NOT’ gate (Negation) symbol.
The symbol is a triangle with a small circle showing inversion. It has one input and one output, and the output is always the opposite of the input.