SHS1 Physics · Semester 2 Week 11: Analogue Electronics

Lesson notes

Learning Objectives

Indicator: 1.3.3.LI.2 - Describe the basic structure and applications of the PN junction diodes in reverse and forward-biased circuits.

By the end of the lesson, learners can:

Draw and label the basic structure of a PN junction diode, identifying the P-type and N-type regions, the depletion layer, and the two terminals (anode and cathode).
Explain what is meant by forward bias and reverse bias in terms of the connection of the external battery to the diode terminals.
Describe the behaviour of a PN junction diode in a forward-biased circuit (conducts current) and in a reverse-biased circuit (blocks current), using the concepts of depletion layer width and barrier potential.
Set up a simple circuit with a diode, resistor and a battery to demonstrate forward and reverse biasing, and predict which way the current flows.
State at least three practical applications of PN junction diodes in forward-bias and reverse-bias conditions, including LEDs and Zener diodes.

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Curriculum details

Strand: Electric Field, Magnetic Field and Electronics (Strand 3)
Sub-strand: Analogue Electronics (3.3)
Content standard: 1.3.3.CS.1 - Demonstrate knowledge and understanding of the development and functions of diodes 1.3.3.LO.1 Explain the basics of semiconductor structure and working principles and their applications in LEDs and Zener diodes.
Indicator: 1.3.3.LI.2 - Describe the basic structure and applications of the PN junction diodes in reverse and forward-biased circuits.
Suggested placement: Semester 2, Week 11 (Week 31 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 72

Exemplars (from the NaCCA curriculum)

Experiential Learning: Learners, using LEDs, resistors and a source, discuss forward and reverse biasing and relate it to applications.
Encourage diverse perspectives and contributions.
Assessment (1.3.3.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding.
Teaching and Learning Resources:
- Videos
- Interactive simulations
- Flash cards
- LEDs,
- Zener diodes