Reading Boolean Expressions from Circuit Diagrams
Part of Boolean Expressions — GCSE Computer Science
This key facts covers Reading Boolean Expressions from Circuit Diagrams within Boolean Expressions for GCSE Computer Science. Revise Boolean Expressions in Boolean Logic for GCSE Computer Science with 15 exam-style questions and 22 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 6 of 11 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 6 of 11
Practice
15 questions
Recall
22 flashcards
Reading Boolean Expressions from Circuit Diagrams
Work LEFT to RIGHT through the circuit, writing down what each gate does:
| Circuit Description | Step-by-Step Build-Up | Final Boolean Expression |
|---|---|---|
| A and B go into AND gate | A → AND ← B | A AND B |
| A goes through NOT gate, output goes to AND with B | A → NOT → AND ← B | NOT(A) AND B |
| A and B into OR gate, result goes into NOT gate | A → OR ← B → NOT | NOT(A OR B) |
| A and B into AND gate, result goes to OR gate along with C | A → AND ← B → OR ← C | (A AND B) OR C |
| A through NOT, B as-is, both to OR, then to AND with C | NOT(A) → OR ← B → AND ← C | (NOT(A) OR B) AND C |
Pro tip: Always add brackets to make the order clear, especially with mixed operations!