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logic gates

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4 detailed 50-minute lessons with teaching scripts, worked examples, parent guides, and assessment criteria.

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Lesson Overview

Total Lessons: 4
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, Eduqas, CCEA

Learning Objectives

Prerequisites

Materials & Equipment

Lesson 1: Introduction: logic gates

Duration: 50 minutes

Starter Activity (5 minutes)

Quick Recall

Write down everything you already know about logic gates. Then check against the key terms: key terms from logic gates. Use a mini-whiteboard or paper.

Main Content (35 minutes)

Parent/Teacher Guide:
Before lesson: Read the script below. Pre-teach key vocab: key terms from logic gates.
If stuck: Re-read the revision notes (link above), then break the content into smaller steps.
Extension: See the Stretch & Challenge ideas in Lesson 4.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: logic gates. By the end you will be able to answer exam questions on it unaided. It connects to the rest of Electronics because the ideas here recur across the spec."
Mins 5-20 - Direct Instruction: Work through the core ideas below one at a time; after each, ask your student to explain it back in their own words.
Mins 20-30 - Guided Practice: Model the worked example together, then let your student attempt the first practice question with guidance.
Mins 30-35 - Independent Practice: 2-3 practice questions from Lesson 3 below, with immediate feedback.
First Look

Start with the revision notes summary, then attempt: explain the key ideas of logic gates

Plenary (5 minutes)

Check Out

Your student states one thing they learned and one question they still have about logic gates.

Lesson 2: Core Concepts: logic gates

Duration: 50 minutes

Starter Activity (5 minutes)

Review Previous Lesson

Quick recap: write 3 key points from Lesson 1 on logic gates. Check them against the notes below.

Main Content (35 minutes)

Key Fact: An AND gate outputs 1 only when ALL inputs are 1; its truth table has one high output for two inputs.
Key Fact: An OR gate outputs 1 when ANY input is 1; it produces a low output only when all inputs are 0.
Key Fact: A NOT gate (inverter) outputs the complement of its single input: 0 becomes 1 and 1 becomes 0.
Key Fact: A NAND gate is the complement of AND: output is 0 only when all inputs are 1; it is a universal gate.
Key Fact: A NOR gate is the complement of OR: output is 1 only when all inputs are 0; also a universal gate.
Key Fact: An XOR (exclusive OR) gate outputs 1 when inputs are different; XNOR outputs 1 when inputs are the same.

Practice (10 minutes)

Q: explain the key ideas of logic gates

Answer:

Plenary (5 minutes)

Explain Back

Your student teaches the key points back to you without looking. Fill any gaps immediately.

Lesson 3: Application: logic gates

Duration: 50 minutes

Starter Activity (5 minutes)

Quick Recall

Recall the key terms: key terms from logic gates. Define each in one sentence.

Main Content (35 minutes)

Parent/Teacher Guide: Let your student attempt each question alone first, then compare with the model answer. Award method marks for correct working even if the final answer is wrong.

Work through the practice questions on the revision notes page for this topic.

Plenary (5 minutes)

Error Review

Review any questions answered incorrectly. Identify whether the error was knowledge, method, or reading the question.

Lesson 4: Exam Practice: logic gates

Duration: 50 minutes

Starter Activity (5 minutes)

Command Words

Review what these command words require: state (one point), describe (say what happens), explain (say why), compare (both sides), evaluate (judgement).

Main Content (35 minutes)

Extended Answer

Extended question: Full-Mark Response Describe the function of each fundamental logic gate (AND, OR, NOT, NAND, NOR, XOR) and explain why NAND is a universal gate. <div class="

An AND gate outputs 1 only when all inputs are 1. An OR gate outputs 1 when any input is 1. A NOT gate inverts its single input. A NAND gate outputs 0 only when all inputs are 1 (complement of AND). A NOR gate outputs 1 only when all inputs are 0 (complement of OR). An XOR gate outputs 1 when its inputs are different. NAND is a universal gate because any Boolean function can be built using only NAND gates: a NOT gate is a NAND with both inputs tied together; an AND gate is a NAND followed by a NOT (two NANDs); an OR gate is implemented by inverting both inputs first then feeding them to a NAND (De Morgan's equivalence). Since NOT, AND and OR together can implement any Boolean expression, and all three can be built from NAND alone, NAND is universal. The same reasoning applies to NOR.

Exam Tips: Always write truth tables with inputs in binary counting order (00, 01, 10, 11). | Remember: NAND = NOT(AND); NOR = NOT(OR); the bubble on the symbol indicates inversion. | When asked to identify a gate from a truth table, look at which rows give output 1. | For universal gate questions, show how NOT, AND and OR can each be made from NAND gates. | Label gate symbols clearly with the gate type and input/output labels.
Common Errors: ✗ Confusing OR and XOR truth tables. ✓ OR outputs 1 when any input is 1; XOR outputs 1 only when inputs differ (0,1 or 1,0). ✗ Forgetting the bubble (inversion) on NAND and NOR gate symbols. ✓ NAND has a bubble on the output of an AND symbol; NOR has a bubble on the output of an OR symbol. ✗ Omitting rows from a truth table. ✓ A complete truth table for n inputs must have 2ⁿ rows covering all combinations. ✗ Stating that AND and OR are universal gates. ✓ Only NAND and NOR are universal gates; AND and OR cannot implement inversion alone.
Stretch & Challenge (Grade 8-9):
  • Synoptic links: explain how logic gates connects to another Electronics topic you have studied
  • Real-world: research one real-world use or example of logic gates
  • Critical: "What are the limitations of the models used in logic gates?"

Plenary (5 minutes)

Assessment Criteria
  • Got it: Confident explanation + correct worked examples
  • Getting there: Main points OK, needs support with detail
  • Not yet: Confused on key concepts - re-run Lesson 2

Homework & Consolidation

Recommended Resources

🎓 Smart Lesson (Guided)