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Year 10
OCR

Creating logic circuits

I can create circuit diagrams to represent logic circuits that solve a problem.

icon-background-square
New
New
Year 10
OCR

Creating logic circuits

I can create circuit diagrams to represent logic circuits that solve a problem.

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These resources will be removed by end of Summer Term 2025.

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Lesson details

Key learning points

  1. A logic circuit is a set of two or more logic gates that are connected to implement more complex logic.
  2. A digital electronic circuit in a computer system is used to realise solutions to problems.
  3. A circuit diagram illustrates how logic gates are combined to create digital circuits.

Keywords

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

  • Circuit diagram - a picture used to represent a more complex logical statement

Common misconception

Pupils often find it difficult to know what order logic gates should be evaluated. Without brackets, there is still an order of precedence.

Remind pupils of how the order of precedence in maths is applied to calculations. In a similarway, logic gates should be evaluated in the order: brackets, NOT, AND, OR.


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

Pupils could underline inputs, outputs and logic in a statement and then order them before constructing the circuit diagram. Tasks will always have some elements of these as clues as to what to build expressions for.
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Licence

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.
Identify the inputs for this sentence: “If it is raining and not windy, I take an umbrella.”
umbrella (U)
Correct answer: raining (R)
Correct answer: windy (W)
weather (W)
Q2.
A=0 B=1. Give the value of this expression: Q = NOT (A AND B).
Correct answer: 1
0
Q3.
Which logic gate is represented by this symbol?
An image in a quiz
OR
Correct answer: AND
NOT
Q4.
Which logic gate is represented by this symbol?
An image in a quiz
NOT
AND
Correct answer: OR
Q5.
Which logic gate is represented by this symbol?
An image in a quiz
Correct answer: NOT
OR
AND
Q6.
Write an expression for this sentence: “I’ll go bowling (B) if my friend (F) is coming and I have enough pocket money (M)”.
Correct Answer: B = F AND M, B = M AND F, F AND M = B, M AND F = B

4 Questions

Q1.
Which logic gate has the highest operator precedence?
OR
Correct answer: NOT
AND
Q2.
Sofia created a logic circuit to show that cake AND ice cream is NOT allowed. Which logic statement correctly represents this?
Correct answer: NOT (cake AND ice cream)
(cake AND ice cream)
NOT (cake OR ice cream)
(NOT cake) AND ice cream
Q3.
Match the logical expressions to the logic gates required.
Correct Answer:Q = A OR B AND C,one AND gate, one OR gate
tick

one AND gate, one OR gate

Correct Answer:Q = NOT A OR B,one NOT gate, one OR gate
tick

one NOT gate, one OR gate

Correct Answer:Q = A AND B OR C AND NOT D,one NOT gate, two AND gates, one OR gate
tick

one NOT gate, two AND gates, one OR gate

Q4.
You are tasked with designing a logic circuit for the statement: "Q = A AND B or C". Which of the following logic gates do you need, and what is the correct order of evaluation?
Correct answer: one AND gate and one OR gate, evaluate AND first
one AND gate and one OR gate, evaluate OR first
two OR gates and one AND gate, evaluate OR first
two AND gates and one OR gate, evaluate AND first