Lesson Notes By Weeks and Term v4 - JHS 1
CONVERSION AND CONSERVATION OF ENERGY
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CONVERSION AND CONSERVATION OF ENERGY
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Subject: Science
Class: JHS 1
Term: 3rd Term
Week: 1
Grade code: B7.4.3.1.2
Strand code: 4
Sub-strand code: 3
Content standard code: B7.4.3.1
Indicator code: B7.4.3.1.2
Theme: FORCES AND ENERGY
Subtheme: CONVERSION AND CONSERVATION OF ENERGY
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Energy is what makes things happen—lighting our homes, cooking food, moving vehicles, charging phones, pumping water, and even playing football. In Ghana, we experience energy conversion daily: a torch converts chemical energy in batteries to light; a fan converts electrical energy to motion; charcoal converts chemical energy to heat for cooking. Understanding conversion and conservation of energy helps learners explain how devices work, use energy wisely, and reduce waste (e.g., saving electricity, choosing efficient appliances).
2.1 Meaning of Energy Energy is the ability to do work or cause change. Examples of “change”: A ball starts moving (motion changes) Water becomes hot (temperature changes) A bulb produces light (light appears) A speaker produces sound (sound is produced)
Unit of energy: joule (J). (At this level, focus more on forms and conversions than heavy calculations.)
2.2 Forms of Energy (JHS1 level) Chemical energy: stored in food, fuel (petrol, LPG, charcoal), batteries. Electrical energy: from ECG supply, generators, solar panels (as electricity), power banks. Kinetic energy: energy of moving objects (running, moving car, spinning fan). Potential energy: stored energy due to position/height (water in a tank on a stand, a stone on a hill). Thermal (heat) energy: energy related to temperature (hot soup, fire, heated iron). Light energy: from the sun, bulbs, torches. Sound energy: from drums, speakers, thunder.
2.3 Energy Conversion (Transformation) Energy conversion means energy changes from one form to another. Important idea: Energy does not disappear. It changes form.