Electrical Systems Design · SHS3 Applied Technology

Lesson notes

Learning Objectives

Indicator: 3.5.1.LI.4 - Describe the construction and principle of operation of DC generators.

By the end of the lesson, learners can:

Identify and describe the main parts of a DC generator and state the function of each part.
Explain the principle of electromagnetic induction as the basis for DC generator operation.
Distinguish between the three types of DC generators: series, shunt, and compound.
Outline the practical applications of each type of DC generator.
Compare the construction and operation of DC generators with AC generators studied in the previous week.

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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.4 - Describe the construction and principle of operation of DC generators.
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.181: 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.181: 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.181: 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.181: prints the learning-indicator code as "2.4.1.LI.4"; filed under the section's own 3.5.1.LI.4
exemplars - p.181: prints the assessment code as "2.4.1.AS.4"; filed under the section's own 3.5.1.AS.4
Curriculum reference: NaCCA curriculum document, p. 181

Exemplars (from the NaCCA curriculum)

Focal Area: DC Generators
1. Types of AC Generators
2. Construction of each type
3. Operation of AC Generator
4. Application
Pedagogy:
Research/ Collaborative Learning: In mixed-ability groups, guide learners to undertake the following activities:
- Describe the construction of DC Generator and state the functions of the parts.
- Outline the types of DC Generators e.g. series, shunt and compound Generator .
- Outline the applications of each type DC Generator .

Assessment (3.5.1.AS.4). The document marks these depth-of-knowledge levels for this indicator: Level 1 Recall; Level 2 Skills of conceptual understanding; Level 3 Strategic reasoning.