1. Today’s Agenda…
Bellringer: What happens to some of the energy in a car engine as chemical energy is being transformed to mechanical?
Notes on Sources of Energy

2. Sources of Energy
Study Pack #6

3. Today’s goals… I can explain where energy comes from.
I can explain what renewable, nonrenewable, and alternative resources are.
I can describe the advantages and disadvantages of using various energy sources.

4. Using Energy
According to the law of conservation of energy, energy cannot be created or destroyed, so where does energy come from?

5. Energy Resources Energy must come from the natural world
Figure 16; page 729
Most of the Earth’s energy comes from the sun
Some of the Earth’s energy comes from radioactive atoms in Earth’s core

6. Energy Resources Fossil Fuels Nuclear Energy Hydroelectricity
Solar Energy
Geothermal Energy
Tidal Energy
Wind Energy
Biomass

7. Fossil Fuels Coal, oil, and natural gas
Made from the remains of organisms that lived millions of years ago
Ancient organisms converted the sun’s light energy into chemical energy now stored in fossil fuels until they burn

8. Fossil Fuels
Fossil fuels are nonrenewable resource – being used up faster than they can be replaced
Produce pollution
Can cause illness, acid rain, global warming

9. Biomass Made from plants Contained stored chemical energy
Corn and sugar cane
Contained stored chemical energy
Can be burned for energy
Example: ethanol in gasoline

10. Nuclear Energy Energy released with uranium atoms split
Energy transformations
No pollution
Uranium is also nonrenewable
Produces nuclear waste
Methods for storing waste – page 731

11. Hydroelectricity
Transforming the potential energy of water behind dams to kinetic energy and then electricity
Water is a renewable resource – constantly replenished
No pollution
Can harm wildlife
Salmon
Use of fish ladders

12. Alternative Energy Sources
Other ways energy can be generated
Solar, wind, and geothermal

13. Solar Energy Capturing the sun’s energy to transform into electricity
Inexhaustible resource – can’t be used up by humans
No pollution
Expensive equipment
Page 734

14. Geothermal Energy
Using the heat generated inside the Earth to transform into electricity
Magma heats water and produces steam
Can only be built in areas where magma is close to the surface
No pollution
Heat pumps – page 735

15. Tidal Energy
Uses the rise of fall of sea level – tides – to produce mechanical energy
No pollution
Inexhaustible resource
Can only be built in certain areas

16. Wind Energy
Wind turns a propeller connected to a generator to produce electricity
No pollution
Produce a lot of noise
Can be harmful to birds

17. Conserving Energy
To make the supply of fossil fuels last longer and to produce less pollution we can reduce our use of energy
How can we do this?

18. More information!
Energy Sources