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49 Cards in this Set
- Front
- Back
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Passive Solar Heating/Cooling
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no mechanical methods are used to utilize the solar energy
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Benifits of using passive solar heating/cooling
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NO NEGITIVE impact on the environment
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Photovoltaics
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Solar panels:technology involving the conversion of the sun's energy into electricity
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How is electricity produced in "non-green" bulidings
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electricity------> coal/gas powered generators which= carbon dioxide
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what angle should solar panels be angled??
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your latitude - 15 degrees
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Problems with solar energy
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1. if the sun does not shine there is no energy produced
2. the initial costs are very expensive |
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How does a solar cell work?
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The particles of sunlight break the bond of electrons from the silicon atoms and the freed electrons move to the top of the cell and move in a current along the panel across wires
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What happens to unused solar energy that is produced?
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It goes back to the grid and therefore your balence goes down because your are giving energy to other people
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What is the cost of installing solar panels
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15,000------->28,000
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How much of the carbon in the atmosphere are fossil fuel power plants responsible for?
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40%
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what are some examples of fossil fuels that release carbon when they are burned to create energy?
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Coal
oil gas |
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mos solar panels convert how much of the sun's energy?
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15-20%
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what is the new more"flexible" solar technology?
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solar sheeting
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what are the benifits and the problems with nuclear power plants?
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BENIFITS: they ar carbon free so do not hurt the environment
PROBLEMS: can be very dangerous if any disasters such as explosions occur and the nuclear waste is radioactive and has very long lifespan |
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what type of power plants are the most carbon producing?
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Coal plants
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What are tides caused by?
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The gravitational pull of the sun and the moon on the earth and the earths oceans
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How many tides do we have in one day?
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Because the earth rotates we have 2 high tides and 2 low tides a day
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when is the greatest tidal range?
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when the moon and the sun are in line with each other
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What is the difference between heat and temperature?
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Heat is the total kinetic energy of all the atoms and molecules that make up a substance
Temperature refers to the intensity---the degree of hotness,average kinetic energy |
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What are the methods of heat transfer?
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Convection
Conduction Radiation |
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Conduction
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the transfer of heat through matter by molecular activity
one one object to another |
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Convection
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transfer of heat by mass movement or circulation within a substance
(heats fluid brings heatwith it as it moves) |
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Radiation
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travels in all directions from source radient energy travels through the vacuum of space
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Scattering
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travels in a stright line but gases and dust particles can re-direct it
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Reflection
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light bounces off an object and STAYS THE SAME wavelength
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Albedo
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is the amount of radiation thatis refelcted by a surface
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Absorbtion
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this is when an object abosrbs the radiation it is often re-emited but it is now DIFFERENT and the wavelengths have change
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Electromagnetic spectrum
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The energy that we recieve from the sun
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How much of the sun's energy is visible light energy?
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43%
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What gases abosrb the shortest wavlengths?
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oxygen and ozone
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which gases absorb the longest wavelength?
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carbon dioxide, water vapor, and ozone
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How much of radiation is absorbed by the earth's surface?
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50%
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How much radiation is absorbed by the atmosphere?
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20%
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How much radiation is reflected/scattered by the atmosphere and the earths surface
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30%
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What is the radiation that is abosorbed by earth than re-emited called?
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terrestrial radiation
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The wavelengths that are re-emited by earth are longer and are experienced how?
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As heat
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What happens to the wavelenghth of a radiating body as it gets hotter?
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the wavelength gets shorter
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The natural greenhouse effect
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-is good
-there would be greater temperature shifts without it -the earth would be a lot cooler |
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The enhanced greenhouse effect
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-BAD
-it is caused by humans -coal oil and gases = carbon dioxide |
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Global Temperatures
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More greenhouse gases= Higher temps
GLOBAL WARMING |
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Human contributions to the Greenhouse effect
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Carbon dioxide 49%
CFC'S 14% Methane 18% Nitrous Oxide 6% Other 13% |
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Different country's contribution to the greenhouse effect
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USA 21%
Russia 14% all of eroupe 14% China 7% Brazil 4% India 9% |
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What from the exosphere influences earth
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-Solar wind
-sun/moon (gravitational influence -Meteor showers(space junk) |
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Evenly distributed solar wind would cause.....?
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Mmore uiform temperatures
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What causes the oceans currents and winds
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un equal temperatures
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Seasons
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1. Length of day affects temp changes
2.Angle of sun above the horizon |
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When are the 2 solstices ?
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SUMMER: june 21/22
WINTER:December 21/22 |
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When are the 2 equinoxes?
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ATUMNAL:september 22/23
VERNAL: march 22/23 |
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Where are the artic circle, tropic of capricorn, tropic of cancer and antatric circle?
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1.the artic circle is north of the equator and at the very top on a globe near the north pole
2. the tropic of capricorn is south of the artic circle but still north of the equator 3.the tropic of capricorn is south of the equator but north of the south pole 4. the antartic circle is south of the equator and is near the south pole |
