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

Lesson notes

Learning Objectives

Indicator: 3.5.1.LI.2 - Describe the construction and principle of operation of DC motors.

By the end of the lesson, learners can:

Define a DC motor and state its function as a device that converts electrical energy into mechanical energy.
Identify and describe the major parts of a DC motor (armature, field windings, commutator, brushes, yoke, and poles) and state the function of each part.
Distinguish between the three types of DC motors (series, shunt, and compound) based on how their field windings are connected.
Explain the principle of operation of a DC motor using the interaction between the magnetic field and current-carrying conductor (motor effect).
Outline at least three practical applications of each type of DC motor in everyday life and industry.

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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.2 - Describe the construction and principle of operation of DC motors.
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.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.2"; filed under the section's own 3.5.1.LI.2
exemplars - p.180: prints the assessment code as "2.4.1.AS.2"; filed under the section's own 3.5.1.AS.2
Curriculum reference: NaCCA curriculum document, p. 180

Exemplars (from the NaCCA curriculum)

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

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