1. Al Mashal EPD 155

2. Chinese first discovered coal in 1000 BC Industrial Revolution of 1890’s increased the demand for fossil fuels.

3. Pollution Economical Depletion

4. Alternate Energy Sources Solar Energy Also called Photovoltaic Cells (PV)

5. Ancient Egyptians Edmund Becquerel, of France, discovered certain materials gave off sparks of electricity when struck with sunlight. Bell Labs revisited this idea in the 1950’s.

6. Made out of silicon When sunlight hits cell, electrons flow from one side of the cell to the other When elections flow current is created

7. Continued PV Cells are connected to provide more electricity. Then hooked up to existing electrical systems.

8. Can be used almost anywhere Examples: Homes Utilities Businesses Road signs Calculators

9. Other than equipment, cost of energy is free No pollution Flexible

10. Only about 17% efficient Very Expensive Some scientists say it takes too much space Only works when sun is shining

11. As fossil fuels deplete and get more expensive, solar energy will be used more Parts of Asia and Africa are using PV cells more Lots of room to grow

13. Sources Alternative Energy Institute, Inc. [File posted on the World Wide Web]. Retrieved October 15, 2000 from the World Wide Web:http://www.altenergy.org/2/nonrenewables/fossil_fuel/depletion/dep letion.html /deplet/deplet Energy Through History [File posted on the World Wide Web]. Retrieved October 15, 2000 from the World Wide Web:http://library.thinkquest.org/20331/history/ org/2org/2 How Solar Cells Work [File posted on the World Wide Web]. Retrieved October 15, 2000 from the World Wide Web: http://www.howstuffworks.com

14. Sources Pimentel, David (1994, September). Renewable Energy: Economic and Environmental Issues [13 Pages]. BioScience [On-Line serial], 44 (8). Available WWW: http://dieoff.com/page84.htm Union of Concerned Scientists. (2000). How Solar Energy Works [File posted on the World Wide Web] Retrieved October 15, 2000 from the World Wide Web: http://www.ucsusa.org/energy/brief.solar.html Zemel, Amos. (2000). Long-Term Perspective On The Development Of Solar Energy. Solar Energy, 68, 379-392.