Brainlag Learn / GCSE Computer Science

Boolean logic

AND, OR, NOT and XOR gates, truth tables, expressions and circuits, built by hand in an interactive gate builder and used to describe real systems.

Lessons

Logic gates and truth tablesAND, OR, NOT and XOR: their symbols, their truth tables and the different ways boards write them. 20 min, free
Combining gatesExpressions and circuits with two and three inputs, truth tables with working columns, and writing the expression for a circuit. 25 min, free
Logic for real systemsTurn descriptions of alarms, lights and machines into expressions, truth tables and circuits, and use logic in program conditions. 25 min, Plus

Practise and test

Question bank40 exam-style question types with mark schemes and worked solutions. 11 are free.
Topic test12 questions, 21 marks, 25 minutes, marked with a grade estimate. Plus.

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