21 energy

21 energy - Squeezing Power from a Stone: Energy Resources...

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Squeezing Power from a Stone: Energy Resources Prepared by Ronald Parker Earlham College Department of Geosciences Richmond, Indiana
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Chapter 14: Squeezing Power from a Stone: Energy Resources Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Energy
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Chapter 14: Squeezing Power from a Stone: Energy Resources Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Sources of Energy There are 5 fundamental sources of energy. Nuclear fusion in the Sun. The pull of gravity. Nuclear fission reactions. Energy in the interior of the Earth. Energy stored in chemical bonds.
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Chapter 14: Squeezing Power from a Stone: Energy Resources Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Sources of Energy Energy directly from the Sun ` s nuclear fusion reactor. Heat and light radiate outward from the Sun. A tiny portion of the solar output strikes Earth. Direct solar energy can be used by humans. Conversion into electricity by photovoltaic cells. Conversion into heat. Controlled fusion is currently beyond human technology.
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Chapter 14: Squeezing Power from a Stone: Energy Resources Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Sources of Energy Energy via photosynthesis. Chlorophyll stores solar energy in H-C bonds. Water and carbon dioxide react to form sugar and oxygen. 6CO 2 + 12H 2 O + light > C 6 H 12 O 6 + 6O 2 + 6H 2 O H-C bonds release stored energy when broken (oxidized). Organic respiration (breakdown of food by organisms). Rapid thermal oxidation (combustion).
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Chapter 14: Squeezing Power from a Stone: Energy Resources Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Sources of Energy Energy from chemical reactions. Energy stored in chemical bonds drives reactions. When bonds are broken, this energy may be used. Exothermic reactions produce heat. Some also produce light and usable energy.
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Chapter 14: Squeezing Power from a Stone: Energy Resources Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Sources of Energy Energy from fossil fuels. Oil, natural gas, and coal derive from living organisms. These materials store energy in preserved H-C bonds. Created by photosynthesis; solar energy from the past. Thus, oil, gas, and coal represent l fossilized sunshine. z
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Chapter 14: Squeezing Power from a Stone: Energy Resources Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Sources of Energy Energy from nuclear fission. Certain radioactive atoms can be fragmented. This process, called fission, yields tremendous energy. Fission energy is used to run nuclear power plants.
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Chapter 14: Squeezing Power from a Stone: Energy Resources Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Sources of Energy Energy from Earth ` s internal heat. Earth
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This note was uploaded on 02/22/2012 for the course CE 70 taught by Professor Johnson during the Fall '07 term at Berkeley.

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21 energy - Squeezing Power from a Stone: Energy Resources...

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