Section 1:  Renewable Energy Today

Chapter 18 Section 1 Presentation
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Key Terms:

• renewable energy
• passive solar heating
  
• active solar heating
  
• biomass fuel
  
• hydroelectric energy
  
• ​geothermal energy
  

Main Ideas:

• Renewable energy is energy from sources that are constantly being formed.
• Solar energy can be used to heat a house directly or to heat another material, such as water, which can then be used to heat a house.  Solar cells can also be used to generate electricity.
  
• Wind power is the fastest growing source of energy in the world.
  
• ​Many people in developing countries get most of their energy from biomass such as fuelwood.  Biomass is increasingly used in developed countries to generate electricity.
  
• Hydroelectric energy is electricity generated by the energy of moving water.
  
• ​Geothermal energy, the heat within the Earth, can be used to generate electricity.