Class: Senior Secondary School 1 (SS1 / SSS 1)
Term: First Term
Week: 4
Age: 15 years
Duration: 45 minutes
Subject: Radio, Tv & Electronics
Curriculum Theme: Trade
Previous Lesson: Conductors, Insulators And Semi-Conductors: Conducting Materials.
Topic: CONDUCTORS, INSULATOR, AND SEMI- CONDUCTORS.
Subject Matter: Insulators, Insulating materials, Air, Glass, Paper, Dry wood, Plastic

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Define an insulator.
List at least four examples of insulating materials.
State two properties of insulating materials.

Affective Domain:

Appreciate the importance of insulators in electrical safety.
Show interest in identifying different insulating materials.

Psychomotor Domain:

Identify various insulating materials when presented with them.
Classify given materials as insulators or non-insulators.

Discuss with peers the uses of different insulating materials in daily life.
Work safely when observing electrical components.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Basic Technology (JSS 1-3) / Senior Secondary Education Curriculum for Trade Subjects.
State Unified Scheme of Work.
Basic Electricity and Electronics by S.O. Akande.
https://nigeriancurriculum.org/radio-tv-electronics-curriculum/
https://www.waeconline.org.ng/e-learning/Radio/Radio.html

Instructional Materials

The teacher will teach this lesson with the aid of:

A glass sheet
A plastic rod
Pieces of paper
A piece of dry wood
Insulated electrical wire
A chart showing various insulating materials

Rationale for the Lesson

This lesson helps pupils understand materials that prevent the flow of electricity, which is important for electrical safety and the correct use of electronic devices. It enables pupils to identify and appreciate the role of insulators in protecting people and equipment from electrical hazards in their homes and communities.

Prerequisite/Previous Knowledge

Pupils have some basic understanding of electricity and have been introduced to the concept of conductors in a previous lesson.

Lesson Content/Board Summary

Insulators

Definition of Insulators

Insulators are materials that do not allow electric current or heat to pass through them easily. They have very high resistance to the flow of electrons.

Properties of Insulators

The following are properties of insulators:

They have high electrical resistance.
They do not conduct electricity or heat.
They are used to protect people from electric shock.
They are often used to cover electrical wires and components.

Examples of Insulating Materials

The following are examples of common insulating materials:

Air: Air is a good insulator, especially dry air. It is used in many electrical components and as an insulator in double-glazed windows.
Glass: Glass is a hard, brittle material. It is an excellent electrical insulator and can withstand high temperatures.
Paper: Dry paper is a good insulator. It is often used in capacitors and as insulation in some cables.
Dry Wood: Wood, when completely dry, acts as an insulator. However, wet wood can conduct electricity due to the presence of water.
Plastic: Plastics are synthetic materials that are widely used as electrical insulators due to their flexibility, durability, and high resistance to electricity. Examples include PVC (Polyvinyl Chloride) used for wire insulation.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and reminds them of the previous lesson on conductors. The teacher then asks pupils to identify objects in the classroom that are used to protect them from electric shock (e.g., plastic casing of fan, rubber soles of shoes).
Pupils’ Activity: Pupils respond to questions and identify objects.
Learning Point: Pupils recall previous knowledge and are introduced to the concept of materials that do not conduct electricity.

Step 2: Definition of Insulators

Time: 7 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher explains the definition of insulators, emphasizing that they resist the flow of electricity. The teacher writes the definition on the board.
Pupils’ Activity: Pupils listen attentively, ask questions for clarity, and write down the definition.
Learning Point: Pupils understand what insulators are.

Step 3: Properties of Insulators

Time: 7 minutes
Teaching Skill: Elucidation/Listing
Teacher’s Activity: The teacher explains the key properties of insulators, such as high resistance and non-conductivity. The teacher writes these properties on the board.
Pupils’ Activity: Pupils listen, take notes, and contribute to the discussion by suggesting why these properties are important.
Learning Point: Pupils learn the characteristics that define insulating materials.

Step 4: Insulating Material – Air

Time: 5 minutes
Teaching Skill: Explanation/Discussion
Teacher’s Activity: The teacher explains why air, especially dry air, is considered an insulator and gives examples of its use (e.g., in gaps between high-voltage lines, in double-glazed windows).
Pupils’ Activity: Pupils listen and discuss how air acts as an insulator in their environment.
Learning Point: Pupils understand air as an insulating material.

Step 5: Insulating Materials – Glass, Paper, Dry Wood, Plastic

Time: 8 minutes
Teaching Skill: Demonstration/Identification
Teacher’s Activity: The teacher displays the instructional materials (glass sheet, plastic rod, paper, dry wood, insulated wire). The teacher explains and demonstrates how these materials are used as insulators in various applications.
Pupils’ Activity: Pupils observe the materials, identify them, and note their insulating properties and uses.
Learning Point: Pupils can identify and understand the applications of common insulating materials.

Step 6: Importance of Insulators

Time: 5 minutes
Teaching Skill: Explanation/Application
Teacher’s Activity: The teacher leads a discussion on the importance of insulators in ensuring electrical safety, preventing short circuits, and protecting electronic components.
Pupils’ Activity: Pupils contribute ideas and state the importance of insulators in daily life.
Learning Point: Pupils appreciate the practical significance of insulators.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define an insulator.
Mention three properties of insulating materials.
List four examples of common insulating materials.
Explain why plastic is widely used for insulating electrical wires.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 3 minutes
Teaching Skill: Summarization/Assignment
Teacher’s Activity: The teacher summarizes the key points of the lesson, reiterating the definition, properties, and examples of insulators. The teacher then gives pupils homework to identify five items in their homes that use insulating materials and state the material used.
Pupils’ Activity: Pupils listen to the summary and copy the homework assignment.
Learning Point: Pupils consolidate their learning and apply knowledge to their environment.

Lesson Keywords

Insulator – A material that does not allow electric current or heat to pass through easily.
Resistance – The opposition to the flow of electric current.
Plastic – A common synthetic material widely used for electrical insulation.
Glass – A hard, brittle material often used as an electrical insulator.
Dry Wood – Wood that has had its moisture content removed, making it an insulator.

Differentiation

For pupils who grasp concepts quickly, the teacher can challenge them to research specialized insulating materials used in high-voltage applications. For pupils needing more support, the teacher will use more visual aids and provide simpler examples, ensuring they can identify at least two common insulators.

Note for teachers using this lesson plan

Ensure to have a variety of real-life insulating materials for demonstration. Emphasize safety precautions when discussing electrical components. Encourage pupils to relate the concepts to their everyday experiences to enhance understanding.