SHS3 Engineering · Semester 1 Week 16: Circuits and Machines

Lesson notes

Learning Objectives

Indicator: 3.2.1.LI.2 - Explain the uses of transformers, DC & AC motors, DC and AC generators, and special electrical machines (i.e., stepper motors, servo motors, etc.)

By the end of the lesson, learners can:

State the primary function of a transformer and distinguish between step-up and step-down transformers, giving one real-life use of each.
Explain at least three uses each of DC motors and AC motors in everyday appliances and industrial settings in Ghana.
Describe the uses of DC generators and AC generators, and identify where each type is commonly found in power generation and local applications.
Explain the unique uses of special electrical machines, specifically stepper motors and servo motors, in precision applications.
Match each electrical machine to its appropriate application scenario and justify the choice using a reason related to the machine’s characteristics.

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Curriculum details

Strand: Energy Systems (Strand 2)
Sub-strand: Circuits and Machines (2.1)
Content standard: 3.2.1.CS.1 - Demonstrate understanding of the application of electrical machines. 3.2.1.LO.1 Explain the types and uses of various electrical machines. 3.2.1.LO.2 Demonstrate how to operate various electrical machines.
Indicator: 3.2.1.LI.2 - Explain the uses of transformers, DC & AC motors, DC and AC generators, and special electrical machines (i.e., stepper motors, servo motors, etc.)
Suggested placement: Semester 1, Week 16 (Week 16 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.
Curriculum reference: NaCCA curriculum document, p. 119

Exemplars (from the NaCCA curriculum)

Experiential Learning: Learners watch videos about the applications of the various machines. Learners share their observations on the uses of the various electrical machines.

Assessment (3.2.1.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.

Teaching and Learning Resources:
- Videos on the applications of electrical machines
- Projector
- Laptop
- Transformers
- AC and DC generators
- AC and DC motors
- special electrical machines, including stepper and servo motor
- Videos on the applications of electrical machines
- Videos on safety measures in the use of electrical machines.