15.3 energy resources pg 462-466 notebook page 117
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15.3 Energy Resources
Pg 462-466
Notebook page 117
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Nonrenewable Energy ResourcesExist in limited in quantities and once used cannot be replaced except over the course of millions of years
Nonrenewable resources include oil, natural gas, coal and uranium (fossil fuels)
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Fossil fuels
Fossil fuels - formed underground from the remains of once-living organisms.
Are the majority of the world’s energy source
Are NOT found everywhereQuickTime™ and a
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http://www.wrongtees.com/product.php/11/fossil_fuels
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Fossil FuelsThe US provides:
2 % of the world’s oil supply25% of the world’s coal supply
Good thingsRelatively inexpensive Usually readily available
Bad thingsTheir use creates pollution We don’t have much in the US
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Renewable Energy ResourcesResources that can be replaced in a relatively short time period of time
MOST originate directly or indirectly from the sun.
Renewable energy resources include hydroelectric, solar, geothermal, wind, biomass, and possibly in the future nuclear fusion.
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Renewable Energy Resources
Include:Hydroelectric SolarGeothermalWindBiomassNuclear Fusion (possibly in the future)
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Hydroelectric EnergyEnergy obtained from flowing waterAs water flows downhill, its GPE is converted into KE.
The KE is used to turn turbines connected to electric generators
Good thingsLow cost to produce and lack of pollution
Some bad thingsUse dams which blocks the flow of water and cause a variety of environmental problems Hamper the run of fish upriver for spawning
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Hydroelectric power plants
Some used as water flows naturally down hill
Some use dams to build and hold back the water to create energy
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Solar Energy
Sunlight converted into usable energy
Passive Solar: like light going through the window
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Active Solar:
Sun heats flat collection plates through which water flows, this water used for your water heater
Sun converted into electrical energy through solar cells
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Geothermal EnergyThermal energy found under the earth’s surface
Pump water underground to create steam which in turn moves the generators to produce electricity
Does not pollute but not found everywhere
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Biomass Energy: Energy stored in living things Use wood, corn stalks (the stuff thrown away), and convert into thermal energy
Use to create bio fuel - a high- energy alcohol fuel
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OthersHydrogen fuel cell: generates energy by reacting hydrogen with oxygen Waste product would be water so it’s nonpolluting
Nuclear Fusion: still being worked on today but would probably produce little pollution or radioactive waste
Wind turbines: convert the kinetic energy in the horizontal movement of wind into rotational energy of the turbines rotator shaft. Rotational energy is then converted into electrical energy by an electric generator. Clean and wind is everywhere but takes up a lot of space
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Conserving Energy Resources
Energy resources can be conserved by reducing energy needs and increasing efficiency of energy use
Finding ways to use less energy or to use energy more efficiently is known as energy conservation
Energy Saving Decisions: turn off lights, carpool, change the light bulbs, etc.