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Terms in this set (37)
What are alternative energy sources?
anything that is not a fossil fuel
can be replaced quick enough to continue to use
can be replaced quick enough to use. once its gone its gone
alternative energy sources that are renewable
sun water wind and biomass
alternative energy sources that are potentially depletable
geothermal and nuclear energy
why is geothermal considered nonrenewable
because our rate of extraction is greater than the rates of natural replenishment
how water and biomass are fundamentally different from solar and wind energy
They can be depleted if the enviroment that renews them is not sustained.
why dont we use renewable energy sources as much as fossil fuels
the cost alot more
difference between direct and indirect solar energy
Direct is energy straight from the sun. Indirect is energy sources caused by the sun.
which alternative energy sources are direct
PV (Photovoltaics), power tower, thermal conversion
which alternative energy sources are indirect
hydropower, wind, bomass
what is the difference between passive and active solar energy
Passive: Using or adjusting natural changes by solar energy without mechanical power.
Active: Require mechanical power to utilize solar energy.
how does passive solar design work
Heat absorbing walls are heated by low angle winter sun by overhangs prevent high angle summer sun.
how does active solar water heating work?
Heat is absorbed which then heats a circulating fluid
what are the benefits and non benefits of active solar power
No use of electricity, but can't use at night.
what are photovoltaics
uses semiconductors to generate electricity directly from sunlight
Enviromental Cost and benefits
good in remote locations but small electrical output. mostly used in watches and calculators
closest to prices of solar pannels
Solar thermal electric generation
-most technically succesful solar power experiment to date
a plant uses synthetic oil that flows through heat exchanges which in turn drive a steam turbine generator.This is a combined system of solar and conventional power generation
where in the us is solar energy potentially the greatest
what are the major advantages of using hydrogen as an energy source
it can be used in the same ways that fossil fuels are used
it can drive cars and heat water and buildings. stored in fuel cells
can be transported in pipes and stored in tanks and can be produce using solar and other renewable energy sources VERY CLEAN
Why is hydrogen not more widely used?
what is hydroelectricity
when we use water to generate power using dams
how much of the us electric supply is generated by hydroelectric power plants
advantages of hydroelectricity
no burning, dams have other uses(recreation, flood control and water storage) efficient
dams lock anadromous fish, reservoirs flood habitat and agricultural land, dams trap sediment
what is tidal power?
power derived from ocean tides
what is wind power
wind power propelles turbines that generate electricity
what limits the use of wind power
advantages of wind power
large energy potentially, turbine design had been drastically improved, cost is competitive with fossil fuels
disadvantages of wind power
kills birds, uses large amounts of land, people dont like the way they look.
what is biomass energy
organic matter such as plants material and animal waste
difference between biomass and ethanol
advantages of biomass
renewable, potentially carbon neutral
disadvantages of biomass
combustion produces particulates, CO2 and other pollutants
what is geothermal energy
a natural heat from the interior of earth
why is geothermal energy limited for use?
because there are only a few places around the world that generate enough current to produce electricity
how does a geothermal groundwater heat pump work?
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