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Computer Science GCES AQA

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  1. Representing Algorithms Aqa
    4 主题
  2. Efficiency Of Algorithms Aqa
    1 主题
  3. Searching Algorithms Aqa
    3 主题
  4. Sorting Algorithms Aqa
    3 主题
  5. Data Types Aqa
    1 主题
  6. Programming Concepts Aqa
    5 主题
  7. Arithmetic Relational And Boolean Operations Aqa
    1 主题
  8. Data Structures Aqa
    3 主题
  9. String Manipulation Aqa
    1 主题
  10. Random Number Generation Aqa
    1 主题
  11. Structured Programming Aqa
    2 主题
  12. Robust And Secure Programming Aqa
    4 主题
  13. Number Bases Aqa
    2 主题
  14. Converting Between Number Bases Aqa
    3 主题
  15. Units Of Information Aqa
    9 主题
  16. Hardware And Software Aqa
    4 主题
  17. Boolean Logic Aqa
    3 主题
  18. Programming Languages And Translators Aqa
    2 主题
  19. Cpu Architecture Performance And Embedded Systems Aqa
    4 主题
  20. Memory Aqa
    2 主题
  21. Secondary Storage Aqa
    3 主题
  22. Fundamentals Of Computer Networks Aqa
    8 主题
  23. Fundamentals Of Cyber Security Aqa
    1 主题
  24. Methods Of Preventing Cyber Security Threats Aqa
    1 主题
  25. Relational Databases Aqa
    2 主题
  26. Ethical Legal And Environmental Impacts Aqa
    2 主题
课 Progress
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Exam code:8525

What is Boolean logic?

  • Boolean logic is used in computer science and electronics to make logical decisions

  • Boolean operators are either TRUE or FALSE, often represented as 1 or 0

  • Inputs and outputs are given letters to represent them

  • To define Boolean logic we use special symbols to make writing expressions much easier 

Boolean Logic Diagrams

What are logic gates?

  • Logic gates are a visual way of representing a Boolean expression

  • The logic gates covered in this course are:

    • AND

    • OR

    • NOT

    • XOR

AND

Expression operator

Circuit symbol

Explanation

A space. space B
(A AND B)
and-gate

Returns TRUE only if both inputs are TRUE 

TRUE AND TRUE = TRUE

Otherwise = FALSE

OR

Expression operator

Circuit symbol

Explanation

A space plus space B

(A OR B)
or-gate

Returns TRUE if either input is TRUE 

TRUE OR FALSE = TRUE 

FALSE OR FALSE = FALSE

NOT

Expression operator

Circuit symbol

Explanation

top enclose A
(NOT A)
not-gate

Reverses the input value

NOT TRUE = FALSE

NOT FALSE = TRUE

XOR (exclusive OR)

Expression operator

Circuit symbol

Explanation

A circled plus B
(A XOR B)
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