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Energy - Lesson: 3, Conservation of energy - Coggle Diagram
Energy - Lesson: 3
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Sources of energy
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Fuels that are formed from the remains of plants and animals buried under the earth millions of years ago are called fossil fuels.
Energy from biomass
Organic waste such as garbage, cow dung, sewage, crop residue , dead plants and animals and dry leaves form biomass. Biomass is decomposed in the absence of oxygen to obtain biogas which is used as a fuel.
Strong winds have enormous amounts of kinetic energy. wind energy is used to rotate the blades of windmills
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- Another common unit of energy is calorie.
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One calorie is defined as the amount of energy needed to raise the temperature of one gram of water by 1degree C.
- Energy is the capacity to do work.
- The SI Unit of energy is joule (J)
- A body is said to have an energy of one joule if it has the capacity to do one joule of work.
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Conservation of energy
Judicious and economic use of energy that is reducing use of non - renewable sources and switching to renewable sources is called conservation of energy.
- Walk or use bicycles to travel small distances
- switch off appliances such as fans when not in use
- use pressure cookers for cooking
- use renewable sources of energy
- use biogas as a source of energy
Law of conservation of energy - energy can neither be created nor destroyed, the total amount of energy always remains constant.
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