SHS3 Applied Technology · Semester 2 Week 8: Electrical Systems Design

Lesson notes

Learning Objectives

Indicator: 3.5.1.LI.3 - Describe the construction and principle of operation of AC Generators

By the end of the lesson, learners can:

Define an AC generator and state at least three types of AC generators.
Identify and describe the functions of the main parts of an AC generator (stator, rotor, field winding, armature winding, slip rings, and brushes).
Explain the principle of operation of an AC generator, including how alternating current is produced through electromagnetic induction.
Distinguish between revolving-field and stationary-field AC generators and state one practical application of each type.
Outline at least three real-world applications of AC generators in Ghana and explain why each application is suited to that type of generator.

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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.3 - Describe the construction and principle of operation of AC Generators
Suggested placement: Semester 2, Week 8 (Week 28 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.3"; filed under the section's own 3.5.1.LI.3
exemplars - p.181: prints the assessment code as "2.4.1.AS.3"; filed under the section's own 3.5.1.AS.3
Curriculum reference: NaCCA curriculum document, p. 181

Exemplars (from the NaCCA curriculum)

Focal Area: AC Generators
1. Types of AC Generators
2. Construction of each type
3. Operation of AC Generator
4. Application
Pedagogy: Research and Collaborative Learning Organise the learners into mixed ability and gender inclusive groups, task them to research on the
- Definition of generators
- types of AC generators.
- Description of the construction of AC generators and the functions of the parts.
- types of AC generators e.g.Revolving field, Stationary field)
- Outline the applications of AC generators.

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