Physics - Senior Secondary 3 - Physics in the Real World (Technology)

Physics in the Real World (Technology)

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Term: 1st Term

WEEK: 10

Class: Senior Secondary School 3
Age: 17 years
Duration: 40 minutes for each of 5 periods
Date:
Subject: Physics
Topic: Physics in the Real World (Technology)
Subtopics:
• Application of electromagnetic field

  • Construction of a galvanometer
  • Electric motor
  • D.C. and A.C. generator

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

  1. Understand the application of electromagnetic fields in real-world technology.
  2. Construct a galvanometer.
  3. Build a simple electric motor.
  4. Understand the principles of operation of both D.C. and A.C. generators.

INSTRUCTIONAL TECHNIQUES:
• Explanation
• Demonstration
• Hands-on activity: Construction of a galvanometer, motor, and generators
• Group work and collaboration
• Video clips on the operation of a galvanometer, motor, and generators

 

INSTRUCTIONAL MATERIALS:
• Magnet
• Copper wire
• Iron core
• Commutator
• Battery
• Electrical components for motor and generator construction
• Physics textbook
• Whiteboard markers
• Video on electric motors and generators

INSTRUCTIONAL PROCEDURES
PERIOD 1-5

PRESENTATION

STEP 1: INTRODUCTION
• The teacher will introduce the concept of the electromagnetic field and its applications in daily life.
• Students will share prior knowledge of motors, generators, and electromagnetism.

STEP 2: EXPLANATION
• The teacher explains the role of electromagnetic fields in technology and how they are used to construct devices like motors, generators, and galvanometers.
• Focus on the basic principles of electromagnetism (Lorentz force, current-carrying conductors in magnetic fields).

STEP 3: DEMONSTRATION
• The teacher demonstrates how to construct a galvanometer using a coil of wire and a magnet.
• Demonstration of electric motor construction using copper wire, magnets, and a battery.
• The teacher will also demonstrate the construction and operation of a simple D.C. and A.C. generator.

STEP 4: STUDENT ACTIVITY
• Students will be divided into groups and tasked with constructing a galvanometer, motor, or generator based on available materials.
• Each group will demonstrate their completed devices to the class and explain how they work.

STEP 5: NOTE TAKING
• The teacher will write summary notes on the whiteboard for students to copy.

NOTE:

  • Galvanometer: A device used to measure small electric currents. It works by using a coil of wire placed in a magnetic field and detecting the movement of the coil.
  • Electric Motor: A device that converts electrical energy into mechanical energy through the interaction of magnetic fields and electric currents.
  • D.C. Generator: A device that converts mechanical energy into direct current (DC) electricity using a coil of wire rotating within a magnetic field.
  • A.C. Generator: Similar to the D.C. generator but produces alternating current (AC) instead.

EVALUATION

  1. What is the function of a galvanometer?
  2. Describe how an electric motor works.
  3. Explain the difference between a D.C. generator and an A.C. generator.
  4. How can you use a magnet to create electricity?

CLASSWORK:
• Sketch the structure of a galvanometer and label its parts.
• List the steps to construct a simple electric motor.

 

CONCLUSION:
• Review the students' work and provide feedback on their understanding.
• Highlight the importance of electromagnetism in modern technology.