Energy in day-to-day life Sources of energy SUMEDHA COLLEGE, 1 Grade 06 2 nd term 3 rd week Miss. SACHITHRANI AMILA
Assignment 4.4 1. Jeep – petrol / diesel 2. Truck – diesel 3. Gas cooker – LP gas 4. Tractor – diesel 5. Train – coal 6. Lamp – kerosene * Fossil fuels are available in the countries such as Saudi Arabia, Russia, Iraq, Kuwait, Qatar, Indonesia, 2 United States, Canada etc.
Biomass Activity 4.3 Let’s make a saw dust stove/ kudu lipa Materials – a tin, PVC tube (4cm diameter and 30cm long), saw dust or rice bran Method – Observation – fire spreads due to the saw dust. Conclusion – Saw dust stove is used to cook food and boil water 3 because saw dust (biomass)can be used as a fuel.
*Plant or animal material which can be used as a fuel is called as biomass. Ex: Firewood coconut shells rotten vegetables saw dust Hay cow dung *Biomass also contain solar energy. Bio gas Methane 4 Biomass Bio oil Ethanol
Wind 1 • Wind is also a source of energy. Importance of wind energy 1. For transportation 2. To pump water 3. To lift an object 4. To operate the windmill 2 5. To grind grains using windmill 6. To generate electricity 3 5
Wind power plants which are used to produce electricity. They can be found in Hambanthota, Puththalam. 6 Wind mill to grind grains.
Activity 4.4 let’s use wind energy to do work • Materials – two spoke wires, pen barrel, circular shaped cardboard, threads, a small weight • Method • Observation – the object is lifted up when this setup is kept in a windy place. 7 • Conclusion – wind energy is used to lift objects.
Home work Do the assignment 4.3 . (page no: 55) 8
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