Analogue Electronics · SHS1 Physics

Lesson notes

Learning Objectives

Indicator: 1.3.3.LI.2 - Describe transistor biasing.

By the end of the lesson, learners can:

Define transistor biasing and explain why biasing is necessary for the correct operation of a bipolar junction transistor (BJT).
Describe the forward and reverse bias conditions applied to the base-emitter (BE) and base-collector (BC) junctions of an NPN transistor.
Identify the correct biasing arrangement for both NPN and PNP transistors in a simple circuit diagram.
Explain the effect of incorrect biasing on the operation of a transistor (no current flow, saturation, or overheating).
Set up and observe a correctly biased transistor circuit using a simulation tool and describe what happens to the collector current as the base current changes.

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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.3 - Demonstrate knowledge and understanding of the processes and functions of the Bipolar Junction 1.3.3.LO.3 Explain the structure and operations of Bipolar Junction Transistors and their applications.
Indicator: 1.3.3.LI.2 - Describe transistor biasing.
Suggested placement: Semester 2, Week 16 (Week 36 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:

content standard text - p.70: the document prints this learning outcome code as 1.3.3.LO.3.1
Curriculum reference: NaCCA curriculum document, p. 76

Exemplars (from the NaCCA curriculum)

Experiential Learning: Using videos or simulations, learners recall biasing and explain transistor biasing.
Ensure that the teaching materials, examples, and illustrations reflect diverse perspectives.
Assessment (1.3.3.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 1 Recall; Level 2 Skills of conceptual understanding.
Teaching and Learning Resources:
- Videos
- PhET interactive simulations
- Flash cards, Interactive virtual laboratory