Today

1
Todays Agenda

• Bellringer Corrections to Exit Slip from Friday
• Notes on Sources of Energy
• Worksheet

2
Sources of Energy

• Study Pack 6

3
Todays 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 Earths energy comes from the sun
• Some of the Earths energy comes from radioactive
  atoms in Earths 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 suns 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
• 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 suns energy to transform into
  electricity
• Inexhaustible resource cant 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