SHS3 Engineering · Semester 1 Week 15: Circuits and Machines

Lesson notes

Learning Objectives

Indicator: 3.2.1.LI.1 - Identify various electrical machines.

By the end of the lesson, learners can:

Identify at least six types of electrical machines from pictures, videos, or physical specimens, stating the category of each (generator, motor, or transformer).
State the distinguishing physical features of AC generators, DC generators, AC motors, DC motors, transformers, stepper motors, and servo motors.
Classify a given electrical machine as either a generator (mechanical input, electrical output), a motor (electrical input, mechanical output), or a transformer (changes voltage levels), using its physical features as evidence.
Match each identified machine to its typical location or use in everyday Ghanaian settings (for example, a transformer on an ECG pole, a motor in a fridge or borehole pump, a generator at a shop or chop bar).
Describe the direction of energy conversion for generators, motors, and transformers when prompted with a simple diagram or physical example.

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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.1 - Identify various electrical machines.
Suggested placement: Semester 1, Week 15 (Week 15 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)

Initiating Talk for Learning: The Facilitator provides a comprehensive list (with pictures) of the types of electrical machines.
Experiential Learning: Learners familiarise themselves with various electrical generators, motors, and transformers In a moderated discussion, learners discuss the physical features of the machines they have familiarised themselves with.

Assessment (3.2.1.AS.1). The document marks these depth-of-knowledge levels for this indicator: Level 1 Recall; Level 2 Skills of conceptual understanding.

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.