geo coservation CHAPTER 12 PART 2

geo coservation CHAPTER 12 PART 2 - CHAPTER 12 PART 2...

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CHAPTER 12 PART 2 ENERGY Spring 2008 WSU BIOLOGY 104
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PHOTOVOLTAIC CELLS Also   captures solar  energy but converts it  directly to electrical  energy Does it by separating  electrons Been in use by US  Space program since  1958
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FUEL CELLS Uses ongoing  electrochemical rxns Similar to batteries except  you add chemical fuel to  battery O from ambient air H is stored as a gas  (difficult and dangerous);  as a liquid it is safer and  takes up less space but  must be kept      -250  C  (-400   F)
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BIOMASS FUELS Wood supplied 90% of  fuel in 1850, now   1% Other countries up to 95%  (about ½ all wood  harvested Dung—mainly burned for  heat Methane—main  component of natural gas methanol made from  plant materials Biodiesel burns cleaner,  comes from vegetanle oil 
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EARTH’S FORCES Falling water—hydroelectric 
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geo coservation CHAPTER 12 PART 2 - CHAPTER 12 PART 2...

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