electronic and electrical components
4 detailed 50-minute lessons with teaching scripts, worked examples, parent guides, and assessment criteria.
Lesson Overview
Total Lessons: 4
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, Eduqas, CCEA
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, Eduqas, CCEA
Learning Objectives
- Explain the key ideas of electronic and electrical components
- Apply electronic and electrical components to exam-style questions
- Develop independent study skills
- Build cross-topic connections
Prerequisites
- Read the revision notes for electronic and electrical components first (GCSE Revise summary)
- Key vocab to pre-teach: D&T Exam Tips
- Basic skills: reading the summary notes and answering the practice questions there
Materials & Equipment
- Exercise book, coloured pens
- Ruler
- Printed revision notes (link below)
- Internet for videos (see Resources)
Lesson 1: Introduction: electronic and electrical components
Duration: 50 minutes
Starter Activity (5 minutes)
Quick Recall
Write down everything you already know about electronic and electrical components. Then check against the key terms: D&T Exam Tips. Use a mini-whiteboard or paper.
Main Content (35 minutes)
Parent/Teacher Guide:
Before lesson: Read the script below. Pre-teach key vocab: D&T Exam Tips.
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.
Before lesson: Read the script below. Pre-teach key vocab: D&T Exam Tips.
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: electronic and electrical components. By the end you will be able to answer exam questions on it unaided. It connects to the rest of Design and Technology 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.
Mins 0-5 - Hook: "Today: electronic and electrical components. By the end you will be able to answer exam questions on it unaided. It connects to the rest of Design and Technology 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 function of a transistor in a circuit that uses a thermistor to switch on a fan when temperature rises.
Plenary (5 minutes)
Check Out
Your student states one thing they learned and one question they still have about electronic and electrical components.
Lesson 2: Core Concepts: electronic and electrical components
Duration: 50 minutes
Starter Activity (5 minutes)
Review Previous Lesson
Quick recap: write 3 key points from Lesson 1 on electronic and electrical components. Check them against the notes below.
Main Content (35 minutes)
Key Fact: Resistors: limit current flow - fixed (colour-coded), variable (potentiometers), thermistors (resistance changes with temperature - used in thermostats).
Key Fact: Capacitors: store and release electrical charge - timing circuits, smoothing power supplies. Electrolytic (high capacity, polarised) and ceramic (low capacity, non-polarised).
Key Fact: Transistors: electronic switches or amplifiers - small base current controls larger collector-emitter current. NPN and PNP types. Essential for logic circuits.
Key Fact: LEDs: light-emitting diodes - convert electrical energy to light, very efficient, polarised. Need a current-limiting resistor. RGB LEDs combine three colours.
Key Fact: Microcontrollers: programmable ICs (PIC, Arduino) - process sensor inputs, execute stored program, control outputs. Enable smart product behaviour without complex analogue circuits.
D&T Exam Tips: For electronics questions: 1) Name the component, 2) State its function, 3) Explain how it works in context, 4) Use calculations where appropriate, 5) Evaluate the component choice.
| Term | Meaning | Example |
|---|---|---|
| Resistor | Limits current | Resistance (Ohms), power (W) |
| Capacitor | Stores charge | Capacitance (Farads), voltage |
| LED | Emits light | Forward voltage, current |
| LDR | Light sensor | Resistance decreases with light |
| Thermistor (NTC) | Temp sensor | Resistance decreases with heat |
| 555 Timer IC | Timer/oscillator | Supply voltage, output current |
Practice (10 minutes)
Q: Explain the function of a transistor in a circuit that uses a thermistor to switch on a fan when temperature rises.
Answer: As temperature rises, the thermistor's resistance decreases, voltage at the transistor's base rises. When base voltage reaches approx 0.7 V, the transistor switches ON, allowing current to flow from collector to emitter, powering the fan. The transistor acts as an electronic switch.
Plenary (5 minutes)
Explain Back
Your student teaches the key points back to you without looking. Fill any gaps immediately.
Lesson 3: Application: electronic and electrical components
Duration: 50 minutes
Starter Activity (5 minutes)
Quick Recall
Recall the key terms: D&T Exam Tips. 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.
Q1: Explain the function of a transistor in a circuit that uses a thermistor to switch on a fan when temperature rises.
Answer: As temperature rises, the thermistor's resistance decreases, voltage at the transistor's base rises. When base voltage reaches approx 0.7 V, the transistor switches ON, allowing current to flow from collector to emitter, powering the fan. The transistor acts as an electronic switch.
Q2: Why does an LED always need a current-limiting resistor? Calculate the resistor value for a 9 V supply, 2 V LED and 15 mA current.
Answer: Without a resistor, excessive current would destroy the LED. R = (Vsupply - VLED) / I = (9 - 2) / 0.015 = 7 / 0.015 = 467 ohms. Nearest standard value: 470 ohm resistor.
Q3: Compare the advantages of using a microcontroller versus a hard-wired analogue circuit for a traffic light sequence.
Answer: Microcontroller: programmable timing, flexible sequence, can add sensors, easy to modify, compact. Hard-wired: fixed sequence, difficult to modify, more components, less reliable. For a traffic light needing changes and sensor integration, a microcontroller is far superior.
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: electronic and electrical components
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 Design an electronic circuit for an automatic nightlight that turns on an LED when ambient light drops below a threshold. Name and explain each component. <div class="
A grade 9 response will: identify components - LDR (high resistance in dark, low in light), variable resistor (sets threshold), NPN transistor (switches LED), LED (light output), current-limiting resistor (protects LED); explain: LDR and variable resistor form a voltage divider - in daylight, base voltage below 0.7 V, transistor off; in darkness, base voltage exceeds 0.7 V, transistor on, LED lights.
Exam Tips: Show Ohm's Law calculations step by step - V = IR rearranged for the unknown | State component function before explaining how it works in the circuit | Know the difference: analogue (continuous) vs digital (on/off, 0/1)
Common Errors: Watch Out! Students often make mistakes here. Wrong: A transistor is just a small switch, similar to a mechanical switch. Correct: A transistor is an electronic switch with NO moving parts - switched by electrical signal (base current). Switching speed is millions of times per second, no contact bounce, no physical wear, can amplify signals, controlled by sensors/microcontrollers. Transistors enable all modern electronics.
Stretch & Challenge (Grade 8-9):
- Synoptic links: explain how electronic and electrical components connects to another Design and Technology topic you have studied
- Real-world: research one real-world use or example of electronic and electrical components
- Critical: "What are the limitations of the models used in electronic and electrical components?"
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
- Consolidation: Re-answer any Lesson 3 practice questions answered incorrectly (20 mins)
- Retrieval: Write flashcards for the key terms: D&T Exam Tips (10 mins)
- Exam practice: One past-paper question on electronic and electrical components from the board websites (15 mins)
- Extension: Explain electronic and electrical components to someone else in your own words (10 mins)