Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
18 Cards in this Set
- Front
- Back
|
what is solar energy?
|
the direct use of the sun's rays to supply heat or electricity
|
|
|
what are the 2 advantages of solar energy?
|
the fuel is free and it's non polluting
|
|
|
what are some of the draw backs of solar energy?
|
price of installation and nessacary equipment and a supplemental heating unit is also needed when there is less solar energy
|
|
|
what happens during nuclear fission?
|
the nuclei of heavy atoms such as uranium-235 are bombarded with neutrons. the uranium nuclei then split into smaller nuclei and emit neutrons and heat energy.
|
|
|
what are some drawbacks of nuclear power?
|
-the cost of building safe nuclear facilities has increased
-there are hazards associated with the disposal of nuclear wastes there is a concern over the possibility of a serious accident that could allow radioactive materials to escape |
|
|
some experts estimate that in the next _________________years, wind power could meet between____________percent of the country's demand for electricity.
|
1st blank: 50 to 60
2nd blank: 5 to 10 |
|
|
what are some draw backs of wind power?
|
the need for technical advances, noise pollution, and the cost of large tracts of land in populated areas are obstacles to development
|
|
|
what is hydroelectric power?
|
power that falling water generates
|
|
|
The water held in a __________ behind a dam is a form of ________________ that can be released through the dam to produce___________.
|
1st blank: reservoir
2nd blank: stored energy 3rd blank: electric power |
|
|
what are some draw backs of hydroelectric power?
|
hydroelectric dams have finite lifetimes
|
|
|
what is an important limiting factor in the development of hydroelectric power plants?
|
the availability of suitable sites
|
|
|
what should a good site must provide to develop a hydroelectric power plant?
|
it must provide a signifigant height for the water to fall and it must have a high rate of flow
|
|
|
what is geothermal energy?
|
energy that can be extracted from earth's internal heat
|
|
|
_____________ is used directly for heating and to turn turbines to generate electric power
|
hot water
|
|
|
what are some drawbacks of geothermal energy?
|
it is inexhaustible
|
|
|
what is tidal power?
|
the strong in-and-out flow that results drives turbines and electric generators.
|
|
|
how is tidal power harnessed?
|
by constructing a dam across the mouth of a bay or an estruary in coastal areas with large tidal range.
|
|
|
what are some drawbacks of tidal power/
|
develpment isnt economical if the tidal range is less than 8 meters or if a narrow enclosed bay isnt available
|
