Class: Junior Secondary School 2 (JSS 2 / JS2)
Term: 3rd Term
Week: 2
Age: 13 years
Duration: 45 minutes
Subject: Basic Science and Technology
Curriculum Theme: Basic Science
Previous Lesson: Thermal Energy: Heat Flow.
Topic: THERMAL ENERGY II
Subject Matter: Heat transfer: Conduction, convection and radiation

Specific Objectives

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

Cognitive Domain:

Define heat transfer.
Distinguish between conduction, convection, and radiation.
State examples of each method of heat transfer.

Affective Domain:

Appreciate the importance of heat transfer in daily life.
Show interest in understanding how heat moves.

Psychomotor Domain:

Identify different methods of heat transfer in various situations.
Demonstrate simple experiments related to heat transfer.

Apply knowledge of heat transfer to explain natural phenomena.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum
State Unified Scheme of Work
Basic Science and Technology for Junior Secondary Schools, Book 2.
https://www.physicsclassroom.com/class/thermalS/Lesson-1/Methods-of-Heat-Transfer
https://www.britannica.com/science/heat-transfer

Instructional Materials

The teacher will teach this lesson with the aid of:

Diagrams showing conduction, convection, and radiation.
A metal rod, a candle or Bunsen burner.
A beaker of water, sawdust, and a heat source.
A radiant heater or a dark/light coloured object exposed to sunlight.

Rationale for the Lesson

Understanding heat transfer helps pupils to explain how heat moves in different materials and environments. This knowledge is important for understanding everyday phenomena like cooking, weather patterns, and how buildings are heated or cooled.

Prerequisite/Previous Knowledge

Pupils should have a basic understanding of heat as a form of energy and its effects from the previous lesson on Thermal Energy I.

Lesson Content/Board Summary

Heat Transfer

Heat transfer is the movement of thermal energy from a region of higher temperature to a region of lower temperature. There are three main methods by which heat can be transferred:

1. Conduction

Conduction is the transfer of heat energy through direct contact between particles of a substance, without the actual movement of the particles from their fixed positions. It is most common in solids.

The following are examples of conduction:

Heating a metal spoon in hot soup.
Heat travelling from a hot pan to its handle.
Touching a hot stove and feeling the heat.

2. Convection

Convection is the transfer of heat energy through the actual movement of fluid (liquid or gas) particles from one place to another. This occurs when warmer, less dense fluid rises and cooler, denser fluid sinks, creating a convection current.

The following are examples of convection:

Boiling water in a pot.
Air conditioning cooling a room (cold air sinks).
The circulation of air in a room heater (hot air rises).
Land and sea breezes.

3. Radiation

Radiation is the transfer of heat energy through electromagnetic waves, such as infrared waves. Unlike conduction and convection, radiation does not require a medium (matter) for heat to be transferred and can travel through a vacuum.

The following are examples of radiation:

Heat from the sun reaching the Earth.
Heat felt from a bonfire or fireplace.
Heat from a radiant heater.
Warmth from a hot light bulb.

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 introduces the topic by asking pupils how they think heat moves from one place to another, linking to their previous knowledge of thermal energy.
Pupils’ Activity: Pupils respond to the teacher’s questions and share their ideas about heat movement.
Learning Point: Pupils recall prior knowledge and are introduced to the concept of heat transfer.

Step 2: Conduction

Time: 10 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher explains conduction using a metal rod and a heat source, demonstrating how heat travels along the rod. The teacher defines conduction and provides examples.
Pupils’ Activity: Pupils observe the demonstration, listen to the explanation, and copy notes on conduction.
Learning Point: Pupils understand heat transfer by conduction and its examples.

Step 3: Convection

Time: 10 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher explains convection using a beaker of water with sawdust and a heat source, showing the movement of particles. The teacher defines convection and provides examples.
Pupils’ Activity: Pupils observe the demonstration, listen to the explanation, and copy notes on convection.
Learning Point: Pupils understand heat transfer by convection and its examples.

Step 4: Radiation

Time: 10 minutes
Teaching Skill: Explanation/Illustration
Teacher’s Activity: The teacher explains radiation using diagrams or by pointing to the sun’s heat. The teacher defines radiation and provides examples.
Pupils’ Activity: Pupils listen to the explanation, observe the illustrations, and copy notes on radiation.
Learning Point: Pupils understand heat transfer by radiation and its examples.

Step 5: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

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

What is heat transfer?
Define conduction, convection, and radiation.
Give two examples of each method of heat transfer.
How is heat from the sun transferred to the Earth?

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 5 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the lesson by reiterating the three methods of heat transfer and their key characteristics. The teacher assigns homework: “Explain how a refrigerator uses the principle of convection to keep food cold.”
Pupils’ Activity: Pupils listen to the summary and copy the homework.
Learning Point: Pupils consolidate their understanding of heat transfer methods.

Lesson Keywords

Conduction – Heat transfer through direct contact of particles.
Convection – Heat transfer through the movement of fluid particles.
Radiation – Heat transfer through electromagnetic waves.
Thermal Energy – Energy associated with the temperature of a substance.
Heat Transfer – The movement of heat from one place to another.

Differentiation

For pupils who grasp concepts quickly, the teacher can ask them to research real-life applications of heat transfer in engineering or medicine. For pupils needing more support, the teacher can provide simplified diagrams and allow them to work in pairs for concept reinforcement.

Note for teachers using this lesson plan

Ensure that demonstrations are conducted safely and clearly. Encourage pupils to relate the concepts of heat transfer to their daily experiences. Emphasize the differences between the three methods. Provide clear and concise definitions for pupils to copy into their notes.