Lecture 14 Energy.ppt

Lecture 14 Energy.ppt - Lecture-14 ENERGY Course Instructor...

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Lecture-14: ENERGY Course Instructor: Md Asif Rahman (ASR) Lecturer, Department of Mathematics and Natural Sciences (MNS) University Building 2 (15 th Floor) E-mail: [email protected]
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Energy What is energy? Energy is an essential ingredient of all activity on earth. Energy is somewhat abstract অববাস্তব ; we cannot see it or feel it, even though we have to pay for it.
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Energy Sources The earth is a vast storehouse of energy. The fossil fuels beneath the surface, the wind and water on its surface, the plants growing upon it, the sunlight falling upon it, these are all sources of energy. All energy sources can be classified into two basic categories: Non-renewable sources : is energy from a natural resource, if it is used, it will be depleted হহ্রাসপহ্রাপ regardless of how it is managed. It can not be regenerated in a timescale relevant to human beings. (Resources that are consumed much faster than nature can create them)
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Examples of non-renewable energy sources .......... Sources: Oil Natural gas Coal known as fossil fuels (because of their organic origin) 2 common characteristics of fossil fuels: 1. produced from decomposition of plant & animal remains & are forms of stored solar energy that are part of our geologic resource base. 2. it has taken millions of years for them to accumulate & form deposits which are mined for human use.
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Renewable sources : A natural resource that is replaced naturally. Therefore, it never runs out. Solar energy, wind, water and wave power, biomass etc. considered as renewable resources. Most renewable sources of energy are also alternative sources of energy. Alternative sources of energy usually refers to an energy source that can be used as a replacement for fossil fuels.
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Concern regarding energy Demand for energy is increasing day by day because of industrialization and population growth. Most of the global energy uses are dependent on non-renewable sources, especially fossil fuel which is supposed to end up soon. Most of the fossil fuel sources are highly polluting and produce Green House Gases.
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Coal Fossilized plant জজীববাশ্ম উদদ্ভিদ material preserved by burial মতদদহ সমবাদহত ক রহ্রা in sediments and compacted and condensed by geological forces. Naturally available in form of solid fossil fuel formed millions of years ago. World coal deposit are ten times greater than conventional oil and gas resources combined.
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Problems with coal Mining 1. May include large scale deforestation 2. Dust & noise pollution 3. Underground mining involves working under risky condition (fire hazards killing) 4. Respiratory diseases ( শবাস প্রশবাদসর ররবাগ ) 5. Land subsidence অবনমন might occur 6.
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