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Chapter 11Chapter 11Resources and EnergyResources and Energy
Section 4Section 4
Alternative Energy SourcesAlternative Energy Sources
Notes 11-4Notes 11-4
Solar EnergySolar Energy
FactFact: Sun puts out enough energy every : Sun puts out enough energy every 15 minutes to meet the needs of the world 15 minutes to meet the needs of the world for one year.for one year. How can we capture that energy and put it to How can we capture that energy and put it to
good use?good use? Why aren’t more people using solar energy as Why aren’t more people using solar energy as
a source of energy?a source of energy?
Solar EnergySolar Energy Passive SystemPassive System::
Sun enters the dwelling and heats the areaSun enters the dwelling and heats the area Windows facing the sun all dayWindows facing the sun all day
Requires no working partsRequires no working parts Active SystemActive System::
Uses solar collectorsUses solar collectors Box with a glass top, placed on a high surface Box with a glass top, placed on a high surface
(roof).(roof). Box has tubes that circulate water through the Box has tubes that circulate water through the
buildingbuilding Cloudy days must used stored heat to maintain Cloudy days must used stored heat to maintain
heat in buildingheat in building
Passive Solar EnergyPassive Solar Energy
Active Solar EnergyActive Solar Energy
Solar EnergySolar Energy
Photovoltaic cellsPhotovoltaic cells:: Convert sunlight directly into electricityConvert sunlight directly into electricity Found in calculatorsFound in calculators Making energy for cities is in the experimental Making energy for cities is in the experimental
stagestage
Geothermal EnergyGeothermal Energy
Water can be used that has been heated Water can be used that has been heated by magma by magma Water is heated as it flows through rockWater is heated as it flows through rock Hot water or steam is used to create Hot water or steam is used to create
electricityelectricity Turning turbines to create electricity in generatorsTurning turbines to create electricity in generators
Water can be pumped into the area that Water can be pumped into the area that has the hot rockshas the hot rocks Through a well that has been dugThrough a well that has been dug Hot water or steam can be used as a direct Hot water or steam can be used as a direct
source of heatsource of heat
Geothermal EnergyGeothermal Energy
Iceland uses geothermal heatIceland uses geothermal heat http://www.youtube.com/watch?annotation_id
=annotation_136343&src_vid=-ajqiPe_9Ko&feature=iv&v=h1LMFyCgs14
http://www.youtube.com/watch?v=kjpp2MQffnw&feature=related
Water and Wind EnergyWater and Wind Energy
Hydroelectric energyHydroelectric energy:: Energy produced by running waterEnergy produced by running water 11% of energy in US comes from 11% of energy in US comes from
hydroelectric power plantshydroelectric power plants Water spins the turbines which spins a shaft Water spins the turbines which spins a shaft
that goes to an electric generatorthat goes to an electric generator
Hoover DamHoover Dam
Water and Wind EnergyWater and Wind Energy TidesTides::
Dams are built to trap water at high tideDams are built to trap water at high tide Water is released to low tideWater is released to low tide Creates moving water and works just like itCreates moving water and works just like it
WindWind:: Small wind mills can give enough energy for Small wind mills can give enough energy for
homeshomes Large wind mill farms can produce enough for Large wind mill farms can produce enough for
neighboring communitiesneighboring communities Wind is not a constant and can not always be Wind is not a constant and can not always be
depended on depended on
Wind TurbinesWind Turbines
HomeworkHomeworkTest Ch. 11Test Ch. 11
Friday, Dec. 14Friday, Dec. 14