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3.4 Computer SystemsDiagram

Logic Gate Symbols

Part of Logic Gates · GCSE GCSE Computer Science revision

This diagram covers Logic Gate Symbols within Logic Gates for GCSE Computer Science. Revise Logic Gates in 3.4 Computer Systems for GCSE Computer Science with 16 exam-style questions and 20 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 5 of 9 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.

Topic position

Section 5 of 9

Practice

16 questions

Recall

20 flashcards

Logic Gate Symbols

AND Gate A B Q Q = A AND B Output 1 if BOTH inputs 1 OR Gate A B Q Q = A OR B Output 1 if ANY input 1 NOT Gate A Q Q = NOT A Output is OPPOSITE of input Key Recognition Points: AND = Flat back • OR = Curved back • NOT = Triangle with bubble

Keep building this topic

Read this section alongside the surrounding pages in Logic Gates. That gives you the full topic sequence instead of a single isolated revision point.

The Three Basic GatesTruth Tables - All Possible CombinationsThe Decision Makers Inside ComputersLogic Gates Reference

Practice Questions for Logic Gates

An AND gate has inputs A=1 and B=0. What is the output?

  • A. 0
  • B. 1
  • C. Always 1
  • D. Always 0
1 markfoundation

Complete the truth table for an OR gate with two inputs A and B. | A | B | Output | |---|---|--------| | 0 | 0 | | | 0 | 1 | | | 1 | 0 | | | 1 | 1 | |

3 marksstandard

Quick Recall Flashcards

16 questions on Logic Gates — practise free

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The Three Basic Gates

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Truth Tables - All Possible Combinations