Solar Energy

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Solar Energy

• Almost all of the earths energy comes from the
  sun.

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Solar Energy

• Solar energy is renewable. Every time the sun
  comes out we can use its energy.

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Solar Energy

• Solar energy systems create no pollution.

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Solar Energy

• There are two types of solar energy systems.
• PassiveHeat
• PhotovoltaicElectricity

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Solar Energy

• Passive solar energy systems collect heat for hot
  water or home heat.

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This house has a passive solar energy system. Do
you know where it is?
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Solar Energy
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Solar Energy
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Solar Energy

• Photovoltaic solar energy systems convert
  sunlight into electricity.

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Solar Energy
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Solar Energy
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Solar Energy

• Photovoltaic solar cells are made of two layers
  of silicon.

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Solar Energy
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Solar Energy

• When sunlight strikes the photovoltaic cell it
  excites the electrons and they start to flow.

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Solar Energy

• The development of light efficient photovoltaic
  cells has lead to the invention of solar cars .

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Solar Energy
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Solar Energy
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Solar Energy

• Photovoltaic cells are used extensively in space.

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Solar Energy
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Solar Energy
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Solar Energy

• In the future solar energy will become important
  as a clean, renewable energy source.

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Solar Energy