102. OCR A Level (H046-H446) SLR15 – 1.4 Logic gates & truth tables

About this video

OCR Specification Reference
AS Level 1.4.3c
A Level 1.4.3d

This video illustrates how the different permutations of zeros and ones applied to logic gates and their output can be recorded in what is known as a “truth table”. It also shows how these truth tables relate to their corresponding logic gate symbols.

Key question:

- How do you translate a logic gate diagram into its associated truth table and Boolean expression and vice versa?

00:00 Logic gates & truth tables
00:06 Intro
00:11 Half adder- an example of a logic diagram
00:23 NOT
00:49 AND
01:16 OR
01:44 XOR
02:20 Summary
02:33 How to remember the different logic gate symbols
03:20 Logic gates and their associated Boolean notation
03:49 A note from the exam board
04:27 From logic diagrams to truth tables to Boolean expressions and Vice Versa - Example 1
06:50 Example 2
07:57 Example 3
08:41 Example 4
09:00 Example 5
09:41 Constructing a logic diagram for a scenario
11:30 Turning a logic diagram into a truth table and Boolean expression
13:17 Key question
13:31 Going beyond the specification
13:37 Different logic gates
15:10 Boolean Algebra cheat sheet
16:04 Outro

Last updated: 22.07.26

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