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					Alternative Energy Sources
                          Wind
             Wind turns the
             blades that are
             connected to a
             generator.




                               Electricity is   Electricity is
Generator changes
                               carried          carried to
wind energy into
                               through          businesses
electricity.
                               cables.          and homes.
                                    Wind

Advantages                              Disadvantages
• Inexhaustible resource               • Inconstant nature of the wind

•Wind energy is free, clean and        • Affects the bird population
non-polluting
                                       • Wind farms generate noise in quiet,
• Wind supply is plentiful             rural site

• Suitable for less sunny regions

• Safe
                              Solar




Sun heats solar panels.    Electricity is carried   Electricity is carried
Solar cells change solar   through cables.          to businesses and
energy into electricity.                            homes.
                                      Solar

Advantages                                Disadvantages
• Clean, non-polluting.                   • Some research and
                                          development not funded.
• Inexhaustible resources that
belongs to no one.                        • Electricity produced is more
                                          expensive.
• Works best in the sunniest, often
the poorest, parts of the world.          • Cannot be used as the only
                                          system in cloudy places.
• Flexible and modular - systems
can be resized.                           • Energy has to be stored in
                                          batteries, hydrogen, water or
• Safe.                                   other matter
                    Hydroelectric




Moving water turns the turbine.


The generator changes the
water energy into electricity
                           Hydroelectric

 Advantages                              Disadvantages
•Does not pollute                        • Dam failures
•Renewable resource                      •Shortage of water
•Low cost of needed fuel                 •Loss of land
• longer plant life                      •Harms aquatic ecosystems
• provides facilities for water sports   •Relocation of people where dam
                                         is built
• tourist attractions
•aquaculture
       Biofuels
(fuels made from biomass)
       Biofuels
(fuels made from biomass)
       Biofuels
(fuels made from biomass)
                            Biofuels

Advantages                       Disadvantages
•Renewable resources              •Diverting food away from human
                                  food chain
•Low cost for needed fuel
                                  •Harmful to water supply
•Reduces dependency on fossil
fuels                             •Fuel for production
                                  •Loss of land for production
Geothermal
                           Geothermal

Advantages                          Disadvantages
                                    •Finding a suitable build location
• Does not create any pollution     •Some areas of land may have the
• Geothermal plants take up very    sufficient hot rocks to supply hot
little room, so you don't need to   water to a power station, but what if
                                    these areas are contained in harsh
purchase a larger area of land
                                    areas of the world (near the poles) or
•Geothermal energy is very clean    high up in mountains.

•No fuel is used to generate the    •A site that has been extracting
                                    steam and turning it into power for
power
                                    many years, may suddenly stop
                                    producing steam.
                                    •Harmful gases can escape from
                                    deep within the earth, through the
                                    holes drilled by the constructors. The
                                    plant must be able to contain any
                                    leaked gases, but disposing of the
                                    gas can be very tricky to do safely.
All images/animations come from
the following sites:
http://greenpoweroregon.com/Images/WindDiagram_Lg.gif
http://www.eia.doe.gov/kids/energy.cfm?page=renewable_home-basics
http://en.wikipedia.org/wiki/File:Hydroelectric_dam.svg
http://www.centreforenergy.com/images/biomass/bioenergy_to_kw.jpg
http://www.ldeo.columbia.edu/edu/dees/U4735/projections/pitman/biomass.ene
    rgy.jpg
http://www.unendlich-viel-energie.de/uploads/media/Biomass_CHP.jpg
http://utahcleanenergy.org/files/u1/BIOMASSTYPES_-_Grahpic_1.gif
http://geothermal.marin.org/GEOpresentation/images/img037.jpg
http://www.clean-energy-ideas.com/articles/disadvantages_of_geothermal_energy.html
http://www.netpilot.ca/aes/wind/dis.html

				
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posted:1/13/2013
language:English
pages:14