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Cambridge AS & A Level Computer Science

3.2Logic gates and logic circuits

Logic gates and logic circuits in Cambridge AS & A 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. 3.2.1Draw and define NOT, AND, OR, NAND, NOR and XOR gates and construct their truth tables.
  2. 3.2.2Construct a logic circuit, truth table or logic expression from a problem statement or from each other.

Lessons

  • Logic circuits, expressions and truth tables

    50 min

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  • Logic gates and truth tables

    40 min

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Sample question

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

Logic gates and logic circuits: sample question

1 mark

A logic circuit has four inputs. How many rows must its complete truth table have?

Only if the answer has a unit, e.g. cm or km/h.

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