Al Mashal EPD 155 Chinese first discovered coal

• Chinese first discovered coal in 1000 BC • Industrial Revolution of 1890’s

• Alternate Energy Sources • Solar Energy • Also called Photovoltaic Cells (PV)

• Ancient Egyptians • Edmund Becquerel, of France, discovered certain materials gave off

• Made out of silicon • When sunlight hits cell, electrons flow from

Continued • PV Cells are connected to provide more electricity. • Then hooked up

• Can be used almost anywhere • Examples: • Homes • Utilities •

• Other than equipment, cost of energy is free • No pollution •

• Only about 17% efficient • Very Expensive • Some scientists say it

• As fossil fuels deplete and get more expensive, solar energy will be

Sources Alternative Energy Institute, Inc. [File posted on the World Wide Web]. Retrieved October

Sources Pimentel, David (1994, September). Renewable Energy: Economic and Environmental Issues [13 Pages]. Bio.

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Al Mashal EPD 155

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

• Pollution • Economical • Depletion

• Alternate Energy Sources • Solar Energy • Also called Photovoltaic Cells (PV)

• 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.

• 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

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

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

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

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

• 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

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/de pletion. html /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/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

Sources Pimentel, David (1994, September). Renewable Energy: Economic and Environmental Issues [13 Pages]. Bio. Science [On-Line serial], 44 (8). Available WWW: http: //dieoff. com/page 84. 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, 68, 379 -392.