II. Active Solar Energy

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II. Active Solar Energy
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A. Active Solar Energy

• 1. Active solar energy uses devices to
  collect, store, and circulate heat produced
  from solar energy
• a. Very complex but can release energy
  long after the sun is gone

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• 2. Procedure
• a. Start with collectors usually large
  flat black plates
• b. Under plates run tubes filled with
  liquid like water or antifreeze
• c. Heated water goes to a storage area
• d. As water cools it goes back to collector
• 3. Can produce enough heat to make steam to
  turn turbines and make electricity
• a. Mojave heats town of 10,000

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B. Photovoltaic cell

• 1. Uses thin wafers of semiconductor material
  to make energy
• a. Semiconductors of silicon and selenium
• 2. Have a positive charged semiconductor and
  a negative one
• 3. Sunlight forces electrons to jump from the
  negative to positive giving current

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• 4. This is what is in solar powered
  calculators and watches
• 5. Have no moving parts and last a long time
• 6. Used now in homes and cars when paired
  with other forms of energy

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