Ronest Model Academy

Lesson Note on Heat and Thermal Energy
Subject: Basic Science
Class: JSS 2
Topic: Heat and Thermal Energy
Duration: 40 minutes
Lesson Objectives
By the end of the lesson, students should be able to:
1. Define heat and thermal energy.
2. Differentiate between heat and temperature.
3. Identify methods of heat transfer.
4. Explain the effects of heat on substances.
5. State some practical applications of heat in everyday life.
Instructional Materials
• Bunsen burner or candle
• Metal rod, wooden rod, and plastic rod
• Thermometer
• Ice cubes and water
• Chart showing heat transfer methods
Lesson Development
Introduction (5 minutes)
• Begin by asking students how they feel when they stand near a fire or hold a cold bottle of water.
• Lead them to understand that what they feel is due to heat energy.
• Introduce the topic “Heat and Thermal Energy.”
Step 1: Meaning of Heat and Thermal Energy (10 minutes)
• Heat is a form of energy that is transferred from a hotter object to a colder one.
• Thermal energy is the total energy of all the particles in a substance due to their motion.
• The faster the particles move, the more thermal energy the substance has.
• Heat flows from regions of higher temperature to regions of lower temperature until equilibrium is reached.
Step 2: Difference Between Heat and Temperature (5 minutes)
Heat Temperature
Form of energy transferred between bodies due to temperature difference. Measure of how hot or cold a body is.
Measured in joules (J). Measured in degrees Celsius (°C) or Kelvin (K).
Depends on the mass and type of substance. Independent of the amount of substance.
Step 3: Methods of Heat Transfer (10 minutes)
1. Conduction: Transfer of heat through solids from particle to particle without movement of the material. Example: A metal spoon getting hot when placed in hot water.
2. Convection: Transfer of heat through liquids and gases by the movement of the fluid itself. Example: Boiling water.
3. Radiation: Transfer of heat through space without the need for a medium. Example: Heat from the sun reaching the earth.
Step 4: Effects of Heat on Substances (5 minutes)
• Expansion of solids, liquids, and gases.
• Change of state (melting, boiling, evaporation, condensation).
• Increase in temperature.
• Drying and cooking of food.
Step 5: Applications of Heat (3 minutes)
• Cooking food.
• Ironing clothes.
• Generating electricity in thermal power stations.
• Welding and metal works.
• Sterilizing medical instruments.
Evaluation (5 minutes)
1. Define heat and thermal energy.
2. Mention two differences between heat and temperature.
3. List and explain three methods of heat transfer.
4. State two effects of heat on substances.
5. Give three uses of heat in everyday life.
Assignment
1. Explain with examples how heat is transferred in the kitchen.
2. Draw and label a diagram showing conduction, convection, and radiation.
Reference Materials
• Basic Science for Junior Secondary Schools (UBE Edition)
• New General Science for Junior Secondary Schools
• Teacher’s lesson notes and charts on heat transfer

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