Physics - Senior Secondary 2 - Electromagnetic induction

Electromagnetic induction

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TERM: 3RD TERM

WEEK: 9

Class: Senior Secondary School 2
Age: 16 years
Duration: 40 minutes for each of 5 periods
Date:
Subject: Physics
Topic: Electromagnetic Induction
Subtopics:
• Faraday’s Law of Electromagnetic Induction
• Lenz’s Law
• Motor Generator Effect
• Eddy Currents

SPECIFIC OBJECTIVES:
By the end of the lesson, students should be able to:

  1. State and explain Faraday’s Law of Electromagnetic Induction.
  2. Understand Lenz’s Law and its application.
  3. Explain the motor-generator effect and how it operates.
  4. Describe the phenomenon of eddy currents and their applications.

 

INSTRUCTIONAL TECHNIQUES:
• Explanation
• Demonstration
• Hands-on Activity: Investigating the effect of rotating wire in a magnetic field
• Questions and Answers
• Video clips on electromagnetic induction and its laws

 

INSTRUCTIONAL MATERIALS:
• Magnets
• Coils of wire
• Power source
• Galvanometer
• Physics textbook
• Whiteboard markers
• Videos on electromagnetic induction

 

INSTRUCTIONAL PROCEDURES
PERIOD 1-5

STEP 1: INTRODUCTION
• The teacher asks students if they have heard of induction in the context of electricity.
• Students are encouraged to share their understanding of how electricity can be generated.

STEP 2: EXPLANATION
• The teacher explains Faraday’s Law, which states that the induced electromotive force (emf) in a circuit is directly proportional to the rate of change of magnetic flux through the circuit.
• Introduction to Lenz’s Law, which states that the direction of induced current opposes the change in magnetic flux.

STEP 3: DEMONSTRATION
• The teacher demonstrates the motor-generator effect using a rotating coil in a magnetic field.
• The teacher explains how eddy currents are induced in a conductor when it moves through a magnetic field.

STEP 4: HANDS-ON ACTIVITY
• Students investigate the effect of rotating a coil in a magnetic field and observe the induced current.

STEP 5: NOTE TAKING
• The teacher writes key points on the board, summarizing Faraday’s Law, Lenz’s Law, and the motor-generator effect.

NOTE
• Faraday’s Law: An induced emf is proportional to the rate of change of the magnetic flux.
• Lenz’s Law: The induced current always opposes the change in magnetic flux.
• Motor Generator Effect: The conversion of mechanical energy into electrical energy using a moving coil and magnetic field.
• Eddy Currents: Circular currents induced in conductors when they move through a magnetic field.

 

EVALUATION

  1. State Faraday’s Law of Induction.
  2. What does Lenz’s Law state?
  3. Explain the motor-generator effect.
  4. What are eddy currents and how are they used?

CLASSWORK:
• Write down the statement of Faraday’s Law and Lenz’s Law.
• Discuss the applications of eddy currents.

 

CONCLUSION:
• The teacher reviews the answers and provides feedback.
• Students are encouraged to think about the practical applications of electromagnetic induction in real life, such as in electric generators.