SHS3 Engineering · Semester 1 Week 18: Circuits and Machines

Lesson notes

Learning Objectives

Indicator: 3.2.1.LI.4 - Explain the safety measures associated with the use of the various electrical machines.

By the end of the lesson, learners can:

List at least five specific safety precautions to observe when operating transformers, AC/DC motors, AC/DC generators, and special electrical machines.
Explain the reason or relevance behind each listed safety precaution, linking the precaution to the risk it prevents (e.g., electric shock, fire, mechanical injury).
Demonstrate the correct sequence for safely connecting, operating, and disconnecting an electrical machine during a practical group activity.
Identify unsafe practices shown in video clips or described in scenarios and suggest the correct safety measure for each situation.
Create a simple safety checklist for operating one electrical machine of their choice, suitable for display in a school workshop.

Sign in with your phone number to read the full note and download the GES plan - free.

Sign in with phone number

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.4 - Explain the safety measures associated with the use of the various electrical machines.
Suggested placement: Semester 1, Week 18 (Week 18 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. 120

Exemplars (from the NaCCA curriculum)

Collaborative Learning: In mixed-ability groups, learners use a type of machine and discuss the safety precautions that should be observed when operating the various electrical machines.
Experiential Learning: Learners watch videos on safety precautions in the use of electrical machines. Through questioning, learners provide a comprehensive list of precautionary measures and their relevance.

Assessment (3.2.1.AS.4). The document marks these depth-of-knowledge levels for this indicator: 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.