View
216
Download
0
Category
Tags:
Preview:
Citation preview
Question of the Question of the DayDay
1.1. One advantage of One advantage of nuclear energy =nuclear energy =
2.2. One disadvantage of One disadvantage of nuclear energy = nuclear energy =
4-19
Question of the Question of the DayDay
1.1. Where does the energy Where does the energy come from when we:come from when we:• burn a fossil fuel?burn a fossil fuel?• use a hydroelectric dam?use a hydroelectric dam?• use ground source use ground source
geothermal? geothermal?
4-26
Announcement:Announcement:
TEST WILL BE TUESDAY 5-3 TEST WILL BE TUESDAY 5-3 (EVEN) AND WEDNESDAY (EVEN) AND WEDNESDAY
5-4 (ODD)5-4 (ODD)
4-26
Alternative Energy Alternative Energy SourcesSources
SolarSolar: Using solar / photovoltaic cells to : Using solar / photovoltaic cells to convert suns energy into electricityconvert suns energy into electricity
Sun excites electrons causing them to flow Sun excites electrons causing them to flow electricity electricity
AdvantagesAdvantages::– RenewableRenewable– No emissions produced (no greenhouse No emissions produced (no greenhouse
gasses)gasses)
DisadvantagesDisadvantages::– Photovoltaic cells are Photovoltaic cells are
expensive up front expensive up front– No electricity at night / No electricity at night /
cloudy days cloudy days– Not all locations are Not all locations are
suitable suitable
Solar Thermal power plantsSolar Thermal power plants – mirrors – mirrors concentrate suns heat energy on an oil, concentrate suns heat energy on an oil, which gets extremely hot. Then oil is which gets extremely hot. Then oil is used to produce steam, steam turns used to produce steam, steam turns turbine and produces electricityturbine and produces electricity
Does not use Does not use photovoltaic photovoltaic cells cells
Alternative Energy Alternative Energy SourcesSources
WindWind – use wind to turn a turbine – use wind to turn a turbine turns turns generator generator producing electricity producing electricity
How is wind created?How is wind created? Sun - warmed air rises and colder air flows Sun - warmed air rises and colder air flows
in behind = windin behind = wind
AdvantagesAdvantages:: No emission / pollutionNo emission / pollution RenewableRenewable
DisadvantagesDisadvantages:: Not suitable for all locations Not suitable for all locations NoiseNoise
Alternative Energy Alternative Energy SourcesSources
BiofuelsBiofuels – converting plant matter into – converting plant matter into fuels as an alternative to gasolinefuels as an alternative to gasoline
Plants used = corn, sugarcane, switchgrassPlants used = corn, sugarcane, switchgrass
BiodieselBiodiesel – using vegetable oil instead of diesel – using vegetable oil instead of diesel
EthanolEthanol – alcohol produced from sugars – alcohol produced from sugars of the plant – used as alternative to of the plant – used as alternative to gasoline. gasoline.
Carbon NeutralCarbon Neutral – even though burning – even though burning biofuels releases CO biofuels releases CO22, biofuels come , biofuels come from plants, which take in CO from plants, which take in CO22… = … = carbon neutral carbon neutral
– problem = farm machinery, fertilizers, problem = farm machinery, fertilizers,
pesticides all use fossil fuels … = not neutralpesticides all use fossil fuels … = not neutral
Alternative Energy Alternative Energy SourcesSources
AdvantagesAdvantages::– RenewableRenewable– ““Neutral” EmissionsNeutral” Emissions– Reduce dependency on foreign Reduce dependency on foreign countries for oilcountries for oil
DisadvantagesDisadvantages::– Land limitations (not enough)Land limitations (not enough)– Cause food prices to rise Cause food prices to rise (use corn for fuel(use corn for fuel instead of food) instead of food)
– Still produces emissionsStill produces emissions
Alternative Energy Alternative Energy SourcesSources
HydroelectricHydroelectric – – using falling water to using falling water to turn turbines turn turbines turn generator turn generator electricityelectricity
AdvantagesAdvantages:: No emissions / pollutionNo emissions / pollution RenewableRenewable Flood controlFlood control
DisadvantagesDisadvantages:: Expensive to buildExpensive to build Dam floods huge areaDam floods huge area Limited locationsLimited locations Damage ecosystems / organisms (ex. Damage ecosystems / organisms (ex.
Migrating salmon) … fish ladderMigrating salmon) … fish ladder
Alternative Energy Alternative Energy SourcesSources
GeothermalGeothermal – – using earths heat using earths heat to produce steam, which to produce steam, which turns a turbine turns a turbine electricityelectricity AdvantagesAdvantages::
– few greenhouse gas emissionsfew greenhouse gas emissions– No fuel neededNo fuel needed– Renewable Renewable
DisadvantagesDisadvantages::– Limited locationsLimited locations– Location may cool offLocation may cool off– Still produces some greenhouse Still produces some greenhouse
gassesgasses
Alternative Energy Alternative Energy SourcesSources
Period 4O stopped on 4-26
Ground Source GeothermalGround Source Geothermal – using – using the constant temperatures of the the constant temperatures of the ground to heat or cool your ground to heat or cool your house.house.
Alternative Energy Alternative Energy SourcesSources
NuclearNuclear – – splitting of uranium atom (fission splitting of uranium atom (fission reaction) to produce heat reaction) to produce heat boils water boils water steam turns turbines steam turns turbines turns generator turns generator electricityelectricity
AdvantagesAdvantages:: No emissionsNo emissions Very efficient energy productionVery efficient energy production Cost effective (electricity is about the same price as coal)Cost effective (electricity is about the same price as coal)
DisadvantagesDisadvantages:: Nonrenewable (uranium Nonrenewable (uranium
supply will run out)supply will run out) Radioactive waste (must Radioactive waste (must
store for years) store for years) Possible meltdown Possible meltdown
spreading radioactivity spreading radioactivity (like Chernobyl, Three (like Chernobyl, Three Mile Island, Japan) Mile Island, Japan)
Alternative Energy Alternative Energy SourcesSources
Periods 3E, 4E, 6O, 4O & 6E
Extra Notes…Extra Notes… Three Mile Island (1979)Three Mile Island (1979)
– Nuclear power plant that melted down Nuclear power plant that melted down (radiation leak)…(radiation leak)…
– ……but NO explosion spreading the but NO explosion spreading the radioactive materialsradioactive materials
Extra Notes…Extra Notes… Chernobyl, Russia (1986)Chernobyl, Russia (1986)
– Nuclear meltdown Nuclear meltdown AND explosionAND explosion– 336,000 people had to move336,000 people had to move– About 30 direct deathsAbout 30 direct deaths– Predicted 4,000 extra cancer Predicted 4,000 extra cancer
deaths in exposed people deaths in exposed people
TidalTidal – – use coming in and out of the tides to use coming in and out of the tides to turn a turbine turn a turbine turn generator turn generator electricity electricityAdvantagesAdvantages:: RenewableRenewable No emissionNo emission
DisadvantagesDisadvantages:: Limited locations (need large Limited locations (need large
difference between high and low difference between high and low tide) tide)
Only produce energy when tides Only produce energy when tides are moving are moving
Costs of maintaining Costs of maintaining
Alternative Energy Alternative Energy SourcesSources
WaveWave – – using up and down motion of waves using up and down motion of waves to create electricityto create electricity
How are waves created?How are waves created?– Created by the windCreated by the wind
AdvantagesAdvantages:: RenewableRenewable No emissionsNo emissions
DisadvantagesDisadvantages:: Need large wavesNeed large waves Must survive storms + salt HMust survive storms + salt H22OO
… … cost of maintainingcost of maintaining
Alternative Energy Alternative Energy SourcesSources
Previewing Previewing AssignmentAssignmentRead pages 37-47 and answer #s 1-12 of the Lesson Review on page 47.
Question of the DayQuestion of the Day
1. Which energy sources 1. Which energy sources involve the production of involve the production of steamsteam use notes from use notes from presentations if necessarypresentations if necessary
11-12
Extra NotesExtra Notes Carbon FootprintCarbon Footprint
– Amount of carbon dioxide you are Amount of carbon dioxide you are responsible for producingresponsible for producing
Carbon FootprintCarbon Footprint
http://www.kohler.com/video/indehttp://www.kohler.com/video/index.jsp?bcpid=823619074&bclid=2x.jsp?bcpid=823619074&bclid=203710843&bctid=76936933203710843&bctid=769369332
http://www.kohler.com/video/indehttp://www.kohler.com/video/index.jsp?bcpid=823619074&bclid=2x.jsp?bcpid=823619074&bclid=203710843&bctid=76936933203710843&bctid=769369332
Where did the energy Where did the energy in fossil fuels come in fossil fuels come from?from? Fossil fuels were originally ……..Fossil fuels were originally ……..
– …….plants and animals..plants and animals. These organisms got their energy from These organisms got their energy from
the…the…– ……sun.sun.
They died, and didn’t…They died, and didn’t…– ……fully decomposefully decompose
So the sun’s energy never was So the sun’s energy never was recycled and is now in the fossil fuelsrecycled and is now in the fossil fuels
Where does all the Where does all the carbon in the fossil fuel carbon in the fossil fuel come from? come from? Plants need...Plants need...
– ……Soil, water, sun and CO2!Soil, water, sun and CO2! CO2 was taken from the CO2 was taken from the
atmosphereatmosphere by plants millions of by plants millions of years ago.years ago.
Plants were never decomposed, Plants were never decomposed, thus the C (carbon) was stored for thus the C (carbon) was stored for millions of years. millions of years.
RIVER
RESERVOIR
Recommended