Grade 12 Physics Unit 4: Electromagnetism

This unit 4, “Electromagnetism,” explores the fundamental connection between electricity and magnetism. You will investigate the behavior of magnetic fields, learn how electric current generates magnetism, and understand the principles of electromagnetic induction that power modern technology like transformers.

---

Chapter 4.1 – Magnets and Magnetic Field

This chapter introduces the fundamental properties of magnets.

• Magnetic Fields: Study the nature of magnets and the invisible magnetic fields they create in the space around them.

---

Chapter 4.2 – Magnetic Field Lines

This section focuses on visualizing magnetic forces.

• Visualization: Learn how to represent the strength and direction of magnetic fields using magnetic field lines.

---

Chapter 4.3 – Current and Magnetism

Discover the link between electricity and magnetism.

• Electromagnetism: Explore how an electric current flowing through a conductor creates a magnetic field around it.

---

Chapter 4.4 – Electromagnetic Induction

This chapter introduces the concept of generating electricity.

• Induction Principles: Demonstrate the principles of electromagnetic induction, the process of generating voltage by changing the magnetic environment.

---

Chapter 4.5 – Faraday’s Law of Electromagnetic Induction

Dive deeper into the mathematics of induction.

• Faraday’s Law: Study Faraday’s Law, which quantifies how a changing magnetic flux induces an electromotive force (EMF).

---

Chapter 4.6 – Transformers

Learn about a critical device in electrical power distribution.

• Working Principles: Describe the working principles of transformers, which use induction to step voltage up or down for efficient power transmission.

---

Chapter 4.7 – Application and Safety

Apply your knowledge to real-world scenarios.

• Safety Rules: Understand and implement pertinent safety rules regarding electromagnetism and high-voltage equipment to prevent accidents.

---

Learning Outcomes

By the end of this unit 4, you will be able to:

• Understand the behaviour of electric and magnetic fields.
• Demonstrate the principles of electromagnetic induction.
• Describe the working principles of transformer.
• Understand and implement pertinent safety rules.