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ZIMSEC O-Level Computer Science

8.36Form 4: Logic gates and truth tables

Form 4: Logic gates and truth tables in ZIMSEC O-Level Computer Science: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. 8.36.1Represent logic gates using their symbols.
  2. 8.36.2Construct truth tables with up to three inputs.
  3. 8.36.3Model electronic circuits using logic gates.

Lessons

  • Designing logic circuits and writing logic expressions

    40 min

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  • Logic gates: NOT, AND, OR, NAND, NOR and XOR

    30 min

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  • Truth tables for logic circuits and expressions

    35 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Form 4: Logic gates and truth tables: sample question

1 mark

A car's warning lamp X comes on when the engine is not running and the headlights are on. A = 1 when the engine is running; B = 1 when the headlights are on. Which expression is correct?

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