1. Chapter Eighteen: Renewable Energy

2. Section One: Renewable Energy Today
energy from sources that are constantly being formed
Solar Energy
Wind Energy
Biomass
Hydroelectricity
Geothermal Energy

3. Section One: Renewable Energy Today
Solar Energy
Energy from the sun
Passive solar heating: uses the sun’s energy to heat something directly
Active solar heating: energy gathered from the sun by collectors and used to heat water or a builiding
Solar Panels

4. Section One: Renewable Energy Today
Wind Power
Converts the mechanical movement of wind to electricity
Wind farms have many windmills
Underdeveloped resource

5. Section One: Renewable Energy Today
Biomass
Biomass fuel: plant material, manure, or any other organic matter that is used as an energy source
Methane is created when organic material is broken down and can be burnt for energy
Alcohols such as ethanol can be used for energy

6. Section One: Renewable Energy Today
Hydroelectricity
Hydroelectric energy: energy produced from moving water
Accounts for 20% of the world’s energy
Advantages
Release no pollutants
Disadvantages
Expensive to build
Changes a river’s flow

7. Section One: Renewable Energy Today
Geothermal Energy
The energy from the heat of the earth’s crust
Heated water or steam from rock formations is used to generate electricity
U.S. is the world’s largest producer

8. Section Two: Alternative Energy and Conservation
Energy sources that are still in development
Tidal power
Ocean thermal energy
Hydrogen

9. Section Two: Alternative Energy and Conservation
Tidal Power
Using the movement of tides to generate electricity
Expensive to build
Ocean Thermal Energy Conversion
Uses the temperature difference between ocean surface waters and deep ocean waters to generate electricity

10. Section Two: Alternative Energy and Conservation
Hydrogen
Can be burned for fuel
Advantages
The most abundant element on earth
Does not release pollutants
Disadvantages
Requires lots of energy to create hydrogen
Lots of hydrogen must be used to create energy
Fuel Cells
Produces electricity chemically by combining hydrogen fuel with oxygen from the air

11. Section Two: Alternative Energy and Conservation
Energy Efficiency
The percentage of energy put into a system that does useful work
Efficient Transportation
Hybrid Cars: have electric and gas motors
Cogeneration
The production of two useful forms of energy from the same fuel source
Waste heat from an industrial furnace can power a turbine for electricity

12. Section Two: Alternative Energy Conservation
Saving energy
Cities can enact energy saving plans
People can used technology in their homes to save energy