Electromagnetic Induction… · SHS3 Physics

Lesson notes

Learning Objectives

Indicator: 3.3.3.LI.2 - Discuss the behaviour of the inductor in a.c and d.c circuits.

By the end of the lesson, learners can:

State the behaviour of an inductor when connected to a steady d.c. source and when the d.c. source is switched on or off.
Explain how an inductor behaves as a short circuit to steady d.c. and as a frequency-dependent opposition (inductive reactance) to a.c.
Describe the phase relationship between voltage across and current through an inductor in an a.c. circuit, and explain the phrase “current lags voltage by 90 degrees.”
Solve simple quantitative problems involving inductive reactance, using the expression X_L = 2 × π × f × L.
Compare and contrast the behaviour of an inductor in d.c. versus a.c. circuits, and predict the effect of changing frequency or inductance on circuit behaviour.

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Curriculum details

Strand: Electric Field, Magnetic Field and Electronics (Strand 3)
Sub-strand: Electromagnetic Induction & Applications (3.3)
Content standard: 3.3.3.CS.2 - Demonstrate knowledge and understanding of induction. 3.3.3.LO.2 Explain the working principles of inductors and their applications.
Indicator: 3.3.3.LI.2 - Discuss the behaviour of the inductor in a.c and d.c circuits.
Suggested placement: Semester 2, Week 9 (Week 29 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. 186

Exemplars (from the NaCCA curriculum)

Talk for learning:
- Discuss the operations of a bicycle dynamo.
- Discuss the operations of a simple a.c. generator.
- Discuss the modification of an a.c. generator into d.c. generator. Recognise diverse talents and perspectives.
Assessment (3.3.3.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding; Level 3 Strategic reasoning; Level 4 Extended critical thinking and reasoning.
Teaching and Learning Resources:
- Audio-visuals
- Internet
- Projectors
- YouTube
- Interactive virtual laboratory
- Practical
- Reference laboratory books setup