SHS3 Applied Technology · Semester 2 Week 7: Electrical Systems Design

Lesson notes

Learning Objectives

Indicator: 3.5.1.LI.1 - Describe the construction and principle of operation of AC motors.

By the end of the lesson, learners can:

State at least two types of AC motors (induction and synchronous) and give one distinguishing feature of each.
Identify and describe the main parts of an AC motor, namely the stator and rotor, and state the function of each part.
Explain, in simple terms, the principle of operation of an AC motor, including how the rotating magnetic field causes the rotor to turn.
Outline at least three practical applications of AC motors in homes, farms, and industries in Ghana.
Compare the construction of an induction motor with that of a synchronous motor and state one advantage of each type.

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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.1 - Describe the construction and principle of operation of AC motors.
Suggested placement: Semester 2, Week 7 (Week 27 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.180: 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.180: 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.180: 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.180: prints the learning-indicator code as "2.4.1.LI.1"; filed under the section's own 3.5.1.LI.1
exemplars - p.180: prints the assessment code as "2.4.1.AS.1"; filed under the section's own 3.5.1.AS.1
Curriculum reference: NaCCA curriculum document, p. 180

Exemplars (from the NaCCA curriculum)

Focal Area: AC Motors
1. Types of AC motors (induction, Synchronous)
2. Construction of each type (Stator, Rotor)
2. Operation of AC Motors
4. Application
Pedagogy:
1. Talk for Learning Through a whole class discussion, guide learners to discuss the meaning of motors
2. Research/ Collaborative Learning: In mixed-ability groups, guide learners to undertake the following activities:
- State the types of motors e.g. AC motors.
- Describe the construction of AC motors and state the functions of the parts.
- Outline the types of AC motors e.g.
- Outline the applications of AC motors.

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