Logic gates are electronic combinational circuits which contain one or more electrical inputs and usually one output.
A combinational circuit’s output depends on the state of it’s inputs.
We use truth tables to document the behaviour of a logic gates.
In class demonstration
Demonstrate an AND gate and describe with a truth table and in words
(Teacher constructs the truth table from description for a 2 input and a 3 input gate)
“An AND gate’s output is true only when both inputs are true”
Homework/In class exercise
Draw the truth table for the following gates
Describe their outputs or mode of operation using a well formed sentence in English. E.g “An AND gate’s output is true only when both inputs are true”
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