Truth Tables

Dividing Line


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Information

Both Boolean Algebra and Truth Tables are used to describe Logical Expressions.

The most common Boolean Operators are AND, OR and NOT.


Information

A NOT Gate has just one input. The output of the gate will be the opposite of the input.


NOT Gate

A Q
1 0
0 1


The Boolean Expression for this circuit is written as Q = NOT A.


Information

An AND Gate has two inputs and one output. With an AND Gate, both inputs have to be 1 in order for the output to be 1.

AND Gate


A B Q
0 0 0
10 0
0 1 0
1 1 1


The Boolean Expression for this circuit is written as Q = A AND B.


Information

The OR Gate has two inputs. One or both inputs must be 1 to output 1, otherwise it outputs 0.

OR Gate


A B Q
0 0 0
0 1 1
1 0 1
1 1 1

The Boolean Expression for this circuit is written as Q = A ORB .

Task

Have a go at completing the Truth Tables for each of the three Logic Gates you have learnt about.

Do IT Truth Tables Activity

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Last modified: Friday, 19 February 2021, 10:41 AM