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Year 10
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Introduction to logic circuits

I can combine logic gates to build circuits.

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New
New
Year 10
OCR

Introduction to logic circuits

I can combine logic gates to build circuits.

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Lesson details

Key learning points

  1. Boolean logic is the foundation of all digital circuit design.
  2. A logic circuit is a set of two or more logic gates that are connected to implement more complex logic.
  3. A digital electronic circuit in a computer system is typically made up of millions of logic gates.

Keywords

  • Logic circuit - a combination of two or more logic gates used to represent a more complex Boolean expression

  • Truth table - a table showing the outputs for all possible combinations of inputs to a logic gate or logic circuit

Common misconception

As logic gates are limited to two input, logic statements should also be limited in the same way.

Logic gates can be combined to created complex circuits that represent any number of logic statements combined.


To help you plan your year 10 computer science lesson on: Introduction to logic circuits, download all teaching resources for free and adapt to suit your pupils' needs...

If learners find it difficult to draw logic circuits, you could use an online tool as an alternative allowing them to test their circuits as they build them.
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This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Lesson video

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6 Questions

Q1.
Which of the following is a Boolean expression?
How many sweets do you have?
Correct answer: The car is red.
What is the time?
Close the door.
Q2.
The output of a NOT gate is when the input is False.
Correct answer: True
False
Q3.
A truth table for an AND gate has possible input combinations.
1
2
Correct answer: 4
Q4.
Which logic gate outputs True when both inputs are False?
Correct answer: none
AND
OR
Q5.
Match the keyword to the definition.
Correct Answer:Boolean,an expression that evaluates to either True or False
tick

an expression that evaluates to either True or False

Correct Answer:logic gate,an electronic component that carries out a logical operation
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an electronic component that carries out a logical operation

Correct Answer:truth table,shows the outputs for all possible combinations of inputs
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shows the outputs for all possible combinations of inputs

Q6.
The CPU uses billions of tiny electronic components called gates.
Correct Answer: logic

5 Questions

Q1.
Which of the following is not a logic gate?
Correct answer: BUT
AND
OR
NOT
Q2.
The output of an AND gate is True only when both inputs are .
Correct Answer: True
Q3.
Match the logic gate to its corresponding function.
Correct Answer:AND,outputs True only if all inputs are True
tick

outputs True only if all inputs are True

Correct Answer:OR,outputs True if at least one input is True
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outputs True if at least one input is True

Correct Answer:NOT,inverts the input
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inverts the input

Q4.
A is a table showing the outputs for all possible combinations of inputs to a logic gate or logic circuit.
Correct Answer: truth table
Q5.
A logic gate can be combined with other logic gates in a .
Correct Answer: circuit, logic circuit