Lesson Plan

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Lesson Plan
Grade: Date: 25/02/2026
Subject: Physics
Lesson Topic: Draw and interpret circuit diagrams containing diodes and light-emitting diodes (LEDs) and know how these components behave in the circuit
Learning Objective/s:
  • Identify and draw correct symbols for diodes and LEDs in circuit diagrams.
  • Explain forward and reverse bias behavior of diodes and LEDs and calculate forward‑voltage effects.
  • Calculate appropriate series‑resistor values to limit LED current using Ohm’s law.
  • Analyse simple circuits to predict LED operation and troubleshoot common errors.
Materials Needed:
  • Projector and screen
  • Whiteboard and markers
  • Printed worksheets with diagram templates
  • Breadboard and jumper wires
  • Assorted diodes and LEDs (different colours)
  • Resistors (220 Ω – 470 Ω)
  • Multimeter and calculators
 Introduction:

Begin with a quick show of everyday LED devices to spark interest. Review students’ prior knowledge of series circuits and voltage. State that by the end of the lesson they will be able to draw accurate diode/LED symbols, predict circuit behaviour, and size resistors correctly.
Lesson Structure:
  1. Do‑Now (5') – Students sketch diode and LED symbols on mini‑whiteboards; teacher checks for correct polarity markings.
  2. Direct Instruction (10') – Explain diode bias, forward voltage, LED characteristics and show symbols using projector slides.
  3. Guided Practice (15') – In pairs, build a simple LED circuit on a breadboard, calculate the required resistor, and verify operation with a multimeter.
  4. Concept Check (5') – Quick Kahoot quiz on bias, symbol identification, and resistor calculation.
  5. Application Activity (10') – Students draw a circuit diagram for a specified LED colour and supply voltage, labeling polarity and resistor value.
  6. Common Mistakes Review (5') – Discuss typical errors; students correct a faulty diagram on the board.
  7. Exit Ticket (5') – Write one thing learned and one lingering question.
Conclusion:

Recap the key steps for drawing diode/LED symbols, determining bias, and sizing resistors. Collect exit tickets and assign a worksheet with two new circuit‑design problems for homework.