Analogue Electronics · SHS1 Physics

Lesson notes

Learning Objectives

Indicator: 1.3.3.LI.3 - Analyse the benefits of using LEDs and the I-V characteristics of Zener diodes and applications.

By the end of the lesson, learners can:

Explain at least four benefits of using light-emitting diodes (LEDs) over traditional incandescent bulbs, with reference to efficiency, lifespan, size and switching speed.
Describe how the I-V characteristic curve of a Zener diode differs from that of an ordinary PN junction diode, particularly in the reverse breakdown region.
Identify the Zener breakdown (knee) voltage from a given I-V characteristic graph and explain its significance in voltage regulation.
Analyse simple circuits that use a Zener diode to regulate voltage and an LED to indicate circuit status.
Justify the choice of an LED or a Zener diode for a given practical application in everyday devices.

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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.3 - Analyse the benefits of using LEDs and I-V characteristics of Zener diodes and applications.
Suggested placement: Semester 2, Week 12 (Week 32 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.
Source document note: The official curriculum document has a fault in this entry, so the curriculum text above is transcribed exactly as printed:

indicator text - p.72: the document prints this learning indicator code as 1.3.3.LI.1.3
exemplars - p.72: the document prints this assessment code as 1.3.3.AS.1.3
Curriculum reference: NaCCA curriculum document, p. 72

Exemplars (from the NaCCA curriculum)

Talk for Learning: Expound on the benefits using LEDs and from the construction of the I-V characteristics of the Zener diodes.
Recognise diverse talents and perspectives.
Assessment (1.3.3.AS.3). 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