Summary 📝

Truth tables are a useful way to show how logic gates work. Each row of a truth table shows all the possible combinations of inputs (usually 1 for true, 0 for false) and what the output will be for each. For example, an AND gate will only give an output of 1 when both inputs are 1. OR gates give an output of 1 if at least one input is 1. NOT gates are different as they only take one input and reverse it – 0 becomes 1 and 1 becomes 0. 

These tables are a simple method to check how logic circuits behave and help students clearly understand how decisions are made in digital systems. Understanding truth tables is an essential skill for building and testing logical circuits in computer systems. 

Key learning Points 📌

• A truth table shows how logic gates respond to all possible input combinations.

• Inputs are either 0 (false) or 1 (true).

• AND gate: output is 1 only if both inputs are 1.

• OR gate: output is 1 if at least one input is 1.

• NOT gate: only has one input and reverses it.

• Use truth tables to test and understand logic circuits.

• They help you work out the output step-by-step.

• A logic circuit with two or more gates can also be shown in a truth table.

• Always list all input combinations to complete the table fully.