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35 Cards in this Set

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  • Back
What are alternative energy sources?
Any source of energy not from fossil fuels.
What is the difference between renewable ands nonrenewable energy sources?
The nonrenewable is extracted faster than it is naturally replenished. Renewable derived from biomass.
Which of the alternative energy sources discussed in this chapter are renewable or nonrenewable?
Renewable: solar, hydro, wind, hydrogen from water, and energy from biomass.
How are 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 are renewable energy sources not used as much as fossil fuels?
Fossil fuels are higher quality energy and not intermitent.
What renewable energy technology has the most promise for meeting US energy needs?
Solar energy
What is the difference between direct and indirect solar energy?
Direct are energy straight from the sun. Indirect are energy sources caused by the sun.
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 asorbing walls are heated by low angle winter sun by overhangs prevent high angle summer sun.
What are the environmental costs and benefits of passive solar?
How does active solar water heating work?
Heat is asorbed heating a cirulating fluid.
What are the costs and benefits of active solar heating systems?
No use of electricity, but can't use at night.
What are photovoltaics (PV)?
Technology that coverts sunlight directly into electricity.
What are the environmental costs and benefits of photovoltaic systems?
What is solar thermal electric power?
Collects solar heat and delivers as steam to turbines.
What are the environmental costs and benefits ?
Hazzards of materials used, Pros: no burning.
Briefly describe the systems set up in Barstow, CA and the Luz project in the Mojave Desert.
Power tower surrounded by mirrors. 9 desert solar farms.
Where in the US is solar energy potential the greatest?
The Southwest
What is ocean thermal conversion and what are the environmental costs and benefits of its use?
Uses expanding vapor to turn turbine.
What is hydrogen fuel?
high-quality clean fuel
What are fuel cells and how do they work?
Battery like Hydrogen storage devices.
What is water power?
Form of stored solar energy.
How much of the US electric supply is generated by hydroelectric power?
What are the advantages and disadvantages of using hydro power?
Pro: Clean power Cons: Migratory, water already has use.
What are micro-hydropower systems?
Hydropower systems with output less than 100kW
What is tidal power?
type of water power derived from ocean tides.
What is wind power?
use of wind currents to produce electricity.
What conditions are necessary for wind power generation?
Constant wind. Open space.
What are the advantages and disadvantages of wind power?
Clean energy. Cons: Take up lots of space, kills birds, aesthetic appeal.
What is biomass fuel?
organic matter used to make energy.
What are the advantages and disadvantages of biomass fuel?
abundant. Cons: Waste from burning.
What is geothermal energy?
Natural heat from the interior of the earth.
How does a geothermal groundwater heat pump work?
What are the advantages and disadvantages of geothermal energy?
What are the environmental costs and benefits ?