Per18_over - Preview of Period 18: Uses of Solar Energy...

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Preview of Period 18: Uses of Solar Energy 18.1 Energy Sources What are the advantages and disadvantages of the various sources of energy? Which energy sources are ultimately derived from solar energy? 18.2 Solar Insolation What determines the amount of solar insolation striking a region of the Earth? How is solar energy used? 18.3 Energy Efficient and Passive Solar Homes What are some features of a passive solar home? 18-1
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Biomass Biomass is plant material or animal waste used as a fuel. Examples: wood, alcohol, dried animal waste. Biomass fuel is renewable. Plants absorb carbon dioxide as part of photosynthesis. The complete combustion of biomass returns carbon dioxide to the atmosphere. Overall, there is no net change in the amount of carbon dioxide in the atmosphere due to the use of biomass. Fossil Fuels Fossil fuels include oil, coal and natural gas Fossil fuels are formed when organic matter is subjected to heat and pressure for millions of years. Fossil fuels are not renewable on a useful time scale Burning fossil fuels releases carbon dioxide into the atmosphere. 18-2
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Tidal energy Energy source: gravitational attraction between the Moon and the Earth. The gravitational attraction of the Moon causes the oceans to form two bulges, one on either side of the Earth. As the Earth spins on its axis, land bordering the oceans passes through both bulges, causing two high tides and two low tides each day. Tidal water flowing into or out of a harbor can be used to turn turbines and generate electricity. 18-3
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Non-Solar Energy Sources Tidal energy Two high tides per day can be used to generate electricity Energy source: gravitational attraction between the moon and the Earth Nuclear Energy Fission of uranium-235 releases thermal energy. This thermal energy can be used heat water
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This note was uploaded on 06/11/2011 for the course PHYSICS 104 taught by Professor Staff during the Winter '11 term at Ohio State.

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Per18_over - Preview of Period 18: Uses of Solar Energy...

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