Electromagnetism · SHS2 Physics

Lesson notes

Learning Objectives

Indicator: 2.3.2.LI.3 - Describe and analyse the structure and working principle of the motor and moving coil galvanometer.

By the end of the lesson, learners can:

Identify and label the key structural parts of a simple electric motor (armature/coil, commutator, brushes, magnets, axle) and state the function of each part.
Describe, step by step, how a current-carrying coil in a magnetic field rotates continuously as a result of the torque acting on it, applying Fleming’s left-hand rule.
Draw a labelled diagram of a moving coil galvanometer and explain how its structure allows it to detect and measure small currents.
Analyse the factors that affect the current sensitivity of a moving coil galvanometer and explain how each factor influences the deflection.
Construct and operate a simple working electric motor in pairs and discuss how its operation demonstrates the principles covered in the lesson.

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Curriculum details

Strand: Electric Field, Magnetic Field and Electronics (Strand 3)
Sub-strand: Electromagnetism (3.2)
Content standard: 2.3.2.CS.2 - Demonstrate knowledge and understanding of the forces set up between parallel current-carrying conductors in a uniform magnetic field and applications. 2.3.2.LO.2 Demonstrate the repulsive and attractive forces between parallel current-carrying conductors in a magnetic field.
Indicator: 2.3.2.LI.3 - Describe and analyse the structure and working principle of the motor and moving coil galvanometer.
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.
Curriculum reference: NaCCA curriculum document, p. 128

Exemplars (from the NaCCA curriculum)

Project-Based Learning: Learners in pairs construct a basic electric motor and discuss its operation.
Draw and discuss the principle of a moving coil galvanometer. Discuss the factors that affect the current sensitivity of the galvanometer.
Provide equitable access to resources and opportunities.
Assessment (2.3.2.AS.3). The document marks these depth-of-knowledge levels for this indicator: Level 4 Extended critical thinking and reasoning.
Teaching and Learning Resources:
- Audio visuals
- Internet
- Projectors
- YouTube
- Interactive virtual laboratory