SHS3 Applied Technology · Semester 2 Week 9: Electrical Systems Design

Lesson notes

Learning Objectives

Indicator: 3.5.1.LI.5 - Describe the construction and principle of operation of a transformer.

By the end of the lesson, learners can:

Define a transformer and state its primary function in an electrical circuit.
Identify and describe the main parts of a transformer (core, primary winding, secondary winding) and the materials used for each.
Explain the laws of electromagnetic induction (Faraday’s and Lenz’s laws) and relate them to how a transformer operates.
Describe the step-by-step principle of operation of a transformer, distinguishing between step-up and step-down transformers.
Work collaboratively in groups to construct a simple model of a transformer and present its operation to the class.

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Curriculum details

Strand: Electrical and Electronic Technology (Strand 5)
Sub-strand: Electrical Systems Design (5.1)
Content standard: 3.5.1.CS.1 - 3.5.1.CS.1 Apply knowledge and understanding of electrical Machines 3.5.1.LO.1 Demonstrate knowledge and understanding of electrical Machines and appliances and apply the knowledge in servicing electrical appliances and circuits
Indicator: 3.5.1.LI.5 - Describe the construction and principle of operation of a transformer.
Suggested placement: Semester 2, Week 9 (Week 29 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.182: prints the content-standard code as "2.4.1.CS.1"; filed under the section's own 3.5.1.CS.1
content standard text - p.182: prints the learning-outcome code as "2.4.1.LO.1"; filed under the section's own 3.5.1.LO.1
content standard text - p.182: the front page prints "Strand 4." for Electrical and Electronic Technology inside the YEAR THREE section, where Year 3's strand 4 is Wood Technology (printed pp.164 and 170); the Contents page (printed p.6) prints "STRAND 5. ELECTRICAL AND ELECTRONIC TECHNOLOGY" for Year 3 and Year 2 numbers the same strand 5, so the row is filed under strand 5
indicator text - p.182: prints the learning-indicator code as "2.4.1.LI.5"; filed under the section's own 3.5.1.LI.5
exemplars - p.182: prints the assessment code as "2.4.1.AS.5"; filed under the section's own 3.5.1.AS.5
Curriculum reference: NaCCA curriculum document, p. 182

Exemplars (from the NaCCA curriculum)

Focal Area: Transformer
- Laws of electromagnetic induction
- The construction of a Transformer
- Operation of the transformer Pedagogy Collaborative/ talk for learning I n mix-ability groups and with the use of the internet, task learners to undergo the following activities:
- Describe a transformer.
- Describe the construction of transformers.
- Explain the Laws of electromagnetic induction and relate it to the operation of transformers.

Assessment (3.5.1.AS.5). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding; Level 3 Strategic reasoning.