where does electricity come from? - fernbank science...
TRANSCRIPT
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Where does electricity come from?
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Electricity is made in a coal-fired power plant, using turbines that are turned by the energy of …
Steam!
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http://a0700202.uscgaux.info/lakes.html
Electricity is made in a powerhouse. There turbines are turned by the weight of the water behind the dam. The water is put there by...
Rain!
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Electricity is made at nuclear power plant by unlocking the power of the…
Atom!
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A wind turbine makes electricity whenever its blades are turning. The energy that turns the blades comes from …
Wind!
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http://www.newenglandbreeze.com/ithaca.shtml
This solar panel makes electricity directly from the energy of the…
Sun!
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http://www.sargentwelch.com/product.asp _Q_pn_E_WL2410_EA_A_Electric+Generator,+Genecon+Hand_E_
This hand generator makes electricity when you crank it. Its energy source is …
You!
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Predict…which electricity source is the…
• most Powerful?• most Polluting?• lowest Priced?• most Popular?
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www.wolverinesports.com/SCI/ELECTRIC/12634.JPG
How many peoplewould have to crank a generatorfor an hour
to make as much electricity as one ounce of coal makes?
most Powerful
32!
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most Polluting
Coal is a major source of…
Mercury pollution in fish…
Carbon dioxide that causes climate change…
Acid rain that weakens trees…
Smog that triggers asthma attacks…
Mountaintop removal when coal is mined.
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lowest Priced
0.00
10.00
20.00
30.00
40.00
50.00
60.00
Old
nuclear
Old coal Old hydro New coal Wind New
hydro
Natural
Gas
Solar
Cost of electricity (cents/kWh)
Maximum
Minimum
Data from http://www.tva.gov/environment/air/ontheair/renewable.htm
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most Popular
Data from http://www.eia.doe.gov
(for now… but in the future?)
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Wind power is the fastest growing renewable source of electricity
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Most states have wind power projects
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Georgia has limited wind power potential
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Cost of solar is going down
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Electricityfrom the Sun
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Will every roof look like this someday?
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Fernbank Solar Experiment
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The Fernbank solar panel is capable of producing 1.29 kW of power
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Click this link to see real time data from the Fernbank solar panelhttp://view2.fatspaniel.net/PV2Web/merge?&view=PV/detail/HostedAdmin&eid=46688
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(Weather records from www.weather.com)
Does the weather matter? Notice any trends?
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What if?
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100 units = Would 100 units = Would still only produce still only produce 22% of current 22% of current electricity usedelectricity used
What if?What if?
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To get to a solar economy:
• Improve building energy efficiency• Keep bringing solar panel costs down
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In the meantime, please save electricity
Change your light bulbs
Look for the Energy Star label
Set the thermostat
Turn off lights