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- 1Recall and identify different forms of energy in familiar Ghanaian scenarios. This objective activates prior knowledge of energy types before introducing the conservation and conversion principle, which is essential because learners must recognise energy sources before understanding how energy changes form
- 2Energy Hunt Around the Classroom — Ask learners to stand and point to one object in the classroom that produces or uses energy. Show them a burning candle (or drawn picture of one) and ask: 'What types of energy does this candle give us?' Learners call out: light energy and heat energy. Record their answers on the board. Then show a picture of Kofi's mobile phone charging from a wall socket and ask: 'Where does the energy come from, and what happens to it?' Learners discuss in pairs, then share. Write their responses: electrical energy → heat energy (the phone gets warm) and light energy (the screen)
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- ENERGY CONVERSION IN A DRY CELL: FROM CHEMICAL TO ELECTRICAL, HEAT, AND LIGHT
- 1Main Activity: Guided Diagram Analysis Using the Textbook and Chart — Display the textbook diagram (or draw on the board) showing a simple dry cell connected to a light bulb and a resistor. Label each part: dry cell, wires, bulb filament, resistor. Explain step by step using simple language: 'Inside this dry cell, there is a chemical substance. When we close the circuit by connecting the wires, that chemical reacts. The reaction releases energy. This chemical energy changes into electrical energy that flows through the wires. When the electrical energy reaches the light bulb filament, the filament gets very hot — that is heat energy. When the filament is hot, it glows — that is light energy.' Point to each energy type on the diagram as you speak. Ask learners to draw and label this diagram in their exercise books with you. Use the chart/diagram TLR to show the energy transformation pathway: Chemical Energy (in dry cell) → Electrical Energy (in wires) → Heat Energy (in filament) → Light Energy (from bulb). Write this pathway on the board as a flow diagram: Chemical → Electrical → Heat → Light
- 2Sub-Activity 1: Identify Energy Types in the Diagram — Give each learner or pair a printed copy of the diagram from the textbook (or they copy the board diagram). Call out: 'Point to the part where chemical energy is stored.' Learners point to the dry cell. Ask: 'Now point to where electrical energy travels.' Learners point to the wires. Ask: 'Where do we see heat energy?' Learners point to the hot filament. Ask: 'Where is the light energy released?' Learners point to the glowing bulb. After each question, invite one learner from the back row, then one from the middle, then one from the front to confirm by calling out the answer. This ensures all learners are active and thinking
- 3Sub-Activity 2: Conservation Principle Explanation — Write on the board: 'LAW OF CONSERVATION OF ENERGY: In a closed system, the total amount of energy stays the same. It does not disappear; it only changes form.' Read this aloud three times with learners repeating chorally. Then ask: 'If we measure all the chemical energy in the dry cell at the start, and then measure all the electrical, heat, and light energy the bulb gives out, will they be equal or different?' Pause. Explain: 'They will be equal. The energy is not lost; it is transformed. Some goes to light, some to heat, but all together they equal the chemical energy we started with.' Use the example of cooking red red at a chop bar: Makola market seller burns firewood (chemical energy from wood) to make heat. The heat cooks the beans. If we could measure all the heat energy produced by the wood and all the heat energy that cooks the beans plus the heat that escapes into the air, they would be equal. Energy is conserved—it changes form but is never lost in a closed system
- 4Differentiation: Struggling learners — work with only TWO energy types first (chemical and electrical). Ask them to draw and label just the dry cell and wires, identifying where each energy type is. Pair them with a stronger learner to add heat and light. Average learners — complete the full four-stage diagram as described. Fast finishers — ask them to draw a second example: a torch (dry cells → electrical → light) and label the energy transformations. Challenge them to explain where the energy goes after the light escapes (it spreads into the air as light energy and heat energy, still conserved but dispersed). Extension task: Ask fast finishers to design their own closed system using a different Ghanaian energy source (e.g. petrol engine, solar panel, hydroelectric dam). They must label where energy starts and all the forms it converts into.
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- 1Textbook with diagram of dry cell circuit
- 2Chart/diagram showing energy transformation pathway (Chemical → Electrical → Heat → Light)
- 3Coloured chalk or markers for board labelling
- 4Exercise books for learner drawings
- 5Optional: Picture of Kofi's mobile phone, image of charcoal stove, image of trotro headlights, image of torch
- 6Sealed transparent box (for plenary reference, if available)
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- 1Energy Transformation Relay — Divide the class into 5 groups. Assign each group one energy type: Group 1 = Chemical, Group 2 = Electrical, Group 3 = Heat, Group 4 = Light, Group 5 = Closed System. Call out: 'In a dry cell circuit, what is the starting energy?' Group 1 (Chemical) stands and shouts 'Chemical Energy!' Then ask: 'What does chemical energy become when the circuit closes?' Group 2 (Electrical) stands and shouts 'Electrical Energy!' Continue this relay through all groups, ending with Group 5 explaining: 'All these energies are conserved — none is lost, only changed!' Repeat the relay twice at increasing speed to reinforce the sequence and concept
- 2Think-Pair-Share: Energy in Your Home — Ask learners to think silently: 'In your compound at home, what devices use energy and convert it to other forms?' Examples: Hajia's charcoal stove (chemical → heat), a lantern at night (chemical/electrical → light), a refrigerator (electrical → cold/heat). Learners whisper their example to their partner. Invite one learner from the left side and one from the right side to share their home example with the whole class. Ask the class: 'Is the energy lost, or does it change form?' Learners respond together: 'It changes form—it is conserved!' Write their two examples on the board under 'Energy in Our Homes'
Exercise
- 1Assessment Question: A dry cell with a bulb in a torch is closed inside a sealed transparent box so no energy can enter or leave from outside. The chemical energy in the dry cell is measured at 600 joules. After the bulb lights, we measure the light energy (200 joules), heat energy from the filament (300 joules), and heat energy lost to the wires and air (100 joules). Explain using the law of conservation of energy whether this is possible. Model answer hint: Yes, this is possible. The total energy output (200 + 300 + 100 = 600 joules) equals the starting chemical energy (600 joules). No energy was lost; it was converted into three forms—light, heat in the filament, and heat dispersed. The system is closed, so the principle of conservation of energy is proven. The energy did not disappear; it changed form in their exercise books.
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- 1Learners will identify and recall forms of energy conversion in their everyday environment. This objective matters because recognising energy conversion helps learners understand how devices they use daily—from electric fans to solar lamps—transform one type of energy into another, making science relevant and observable in their own lives
- 2Energy Sources Around the Classroom: Display a picture chart showing: a solar-powered lamp, a hand-crank torch, a mobile phone charger plugged into a wall socket, and a gas cooker burning in a Ghanaian kitchen. Ask learners: 'What do each of these devices do? What type of energy goes IN to each device, and what comes OUT that we can see or feel?' Learners whisper answers to their partner first, then raise hands. Teacher affirms correct observations (e.g. 'The charger takes electrical energy from the wall and changes it into chemical energy stored in the phone battery')
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- IDENTIFYING AND EXPLAINING ENERGY CONVERSION USING REAL GHANAIAN EXAMPLES
- 1Main Activity—Energy Conversion Diagram Explanation Using Textbook and Chart: Open the Science Textbook to the section on energy conversion. Display a large Chart/Diagram showing five everyday scenarios: (1) A solar panel on a rooftop in Accra → electrical energy in a bulb → light, (2) A wood fire in a compound house → heat energy → cooking food, (3) A trotro engine burning petrol → chemical energy → movement of the bus, (4) A hand-crank torch (as used during harmattan season power cuts) → mechanical energy (turning) → electrical energy → light, (5) A mobile phone battery → chemical energy → electrical energy → sound and light from the screen. Read aloud scenario 1 using the textbook. Say: 'The SUN gives us light energy. The solar panel CHANGES (converts) that light into electrical energy. The light bulb then CHANGES that electrical energy into light we can see at night.' Write on the board: INPUT ENERGY → CONVERSION → OUTPUT ENERGY. Under scenario 1, write: LIGHT (SUN) → SOLAR PANEL → ELECTRICAL (IN WIRE) → LIGHT (IN BULB). Ask: 'What energy went IN? What energy came OUT?' Learners respond chorally. Repeat for scenario 2 (wood fire): CHEMICAL (in wood) → BURNING → HEAT (warm room) → LIGHT (from flames). Do this for all five scenarios systematically so learners see the pattern
- 2Sub-Activity 1—Guided Pair Work: Energy Conversion in Daily Chores: Give each pair of learners a small card describing a Ghanaian daily activity: Pair 1—'Ama uses a charcoal iron to press her school uniform.' Pair 2—'Kwame rides his bicycle to school.' Pair 3—'A radio runs on batteries while Akosua listens to the news.' Pair 4—'Yaw uses a torchlight to walk home after dark.' Pair 5—'Abena cooks groundnut soup on a gas cooker.' Learners discuss in pairs: 'What energy comes IN (the input)? What energy do we USE or see (the output)?' After, select one representative from each pair to stand and say their input and output. Teacher writes on the board for each pair. Example: Pair 1—INPUT: Heat energy (charcoal burning) → OUTPUT: Heat energy (pressing clothes). Emphasise that sometimes input and output are the SAME TYPE, but the energy still CONVERTS in how it is used. Struggling learners: Provide sentence frames: 'The INPUT energy is _____ because _____. The OUTPUT energy is _____ because _____.' Fast finishers: Ask them to find ONE MORE example from home that is not on the card, and explain it to their partner
- 3Sub-Activity 2—Application Task—Drawing and Labelling an Energy Conversion Flow Chart: Give each learner a blank sheet with a simple template: Three boxes connected by arrows. Box 1 = ENERGY SOURCE (INPUT). Box 2 = DEVICE OR PROCESS. Box 3 = ENERGY WE USE (OUTPUT). Learners select ONE scenario from the Chart/Diagram displayed earlier (or one they know from home). They draw or write in each box. For example: Box 1—'Electric power from the national grid (electrical)'; Box 2—'Electric fan'; Box 3—'Movement of air (mechanical energy).' Circulate and check understanding. Ask individual learners: 'How did the electrical energy change in the fan?' Struggling learners: Provide a completed example (e.g. torch) and ask them to do a simpler device (e.g. a lamp). Average learners: Complete the task as described. Fast finishers: Draw TWO energy conversion diagrams and present one to the class, explaining clearly how energy changed
- 4DIFFERENTIATION: Struggling learners—provide pre-printed cards with simple, familiar devices (torch, lamp, cooker) and use shorter sentences for input/output. Use the textbook picture only, not the full chart initially. Pair with a stronger learner for Sub-Activity 1. Average learners—follow the core activity as described using both textbook and chart. Fast finishers—extend by asking: 'Is there any energy LOST when Ama's iron heats up? Where does it go?' (Introduction to energy efficiency; answer: some heat escapes to the air—this is normal in energy conversion). For extension, fast finishers can label a diagram showing WHERE energy might be 'lost' (escaping as heat to the surroundings).
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- 1Science Textbook (energy conversion section)
- 2Chart/Diagram showing five energy conversion scenarios (solar panel, fire, petrol engine, hand-crank torch, mobile phone battery)
- 3Blank A5 cards with daily Ghanaian activities (pairs activity)
- 4Blank sheets and pencils for energy flow chart drawing
- 5Board and marker
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- 1Plenary Activity 1—Energy Conversion Brainstorm and Class Chart: Ask the whole class: 'In the last, how many different energy conversions have we learned about?' Learners call out examples (solar panels, fires, batteries, fans, cookers, etc.). Teacher writes each one on the board quickly. Then ask: 'Which one do YOU use MOST at home? Why is that energy conversion useful to your family?' Select 3–4 learners from different parts of the room (alternate between boys and girls) to answer. Affirm each answer. This consolidates the key idea: energy conversion is EVERYWHERE and helps us live comfortably
- 2Plenary Activity 2—Reflection and Think-Pair-Share: Say: 'Think about a time TODAY when you used a device that converts energy—a phone, a lamp, a cooker, a fan, or the sun's warmth. Close your eyes for 5 seconds and picture it.' Learners whisper their example to their partner. Then ask: 'How many of you can now explain to your family tonight what energy conversion means?' Raise of hands. Say: 'Energy conversion is when one TYPE of energy CHANGES into another TYPE we can USE. You are now scientists who understand this!'
Exercise
- 1Assessment Task—Written Exercise (Consolidation of Phase 1 Objective): Write on the board: 'Kofi uses a mobile phone torch at night. Write or draw: (1) What energy comes FROM the phone battery? (2) What energy comes OUT of the torch? (3) Label your diagram INPUT and OUTPUT.' Model answer: (1) INPUT = Chemical energy (from battery). (2) OUTPUT = Light energy (from the bulb). (3) Diagram shows: BATTERY → TORCH → LIGHT, with INPUT and OUTPUT labels. Accept any clear identification of chemical energy converting to light energy. Struggling learners may answer verbally to the teacher or a partner and draw only. Fast finishers may add a second device example (e.g. the phone screen showing a video = sound + light output) in their exercise books.
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