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Year 8 · Design and technology · CAD and electronics · Lesson 3

Electronic circuits and components

Electronic circuits in design and technology: power, switches, resistors, LEDs (polarity), motors and buzzers, circuit symbols, series circuits and input-process-output systems diagrams.

Whiteboard video lesson: Electronic circuits and components

17-minute video lesson

Teaching, worked examples and 20 practice questions solved step by step.

Watch free for a month

What your child will learn

  • Recognise and draw circuit symbols
  • Explain what each component does
  • Build a series circuit with an LED and resistor
  • Use input-process-output systems diagrams

The method

  1. Systems diagram.
  2. Circuit symbols.
  3. Check.
  4. Test and improve.

Key words: circuit, LED, resistor, switch, series, systems diagram, input, output.

Worked examples

The first three practice questions from the lesson, with every step.

Question 1

What does LED stand for?

  1. Step 1: Light...

Answer: Light-Emitting Diode

Question 2

What does a resistor do?

  1. Step 1: Limits

Answer: limits (reduces) the current

Question 3

What does a cell or battery do?

  1. Step 1: Energy

Answer: provides the electrical energy (power source)