1. Alternative Energy Sources

2. Alternative Sources
As the supply of fossil fuels is diminishing,
the nation looks for alternating ways to
replenish its renewable energy resources.
3 types of renewable energy;
– Solar Energy
– Geothermal Energy
– Energy from water & wind

3. Solar Energy
• Passive system: Collect
heat from the sun, such as
building a house with
windows facing toward the
sun.
• Active system: Using solar
collectors to provide heat.

4. Geothermal Energy
• Energy from the heat of the interior earth.
• Water in rocks is heated by magma.
• Energy has been trapped by drilling wills
to reach the hot water.
• Power turbines generate electricity from
this energy.

6. Energy by Water and Wind
• Energy from Running Water
– Hydroelectric energy is
produced by running water.
– Massive dams hold back
running water and move it
through the plant.
– The force of water spins the
turbines of electrical generators
to produce electricity.

7. Energy from Tides
• The ocean waters that move into and
away from the shore twice a day are
called tides.
• Dams are built to trap water at high tide
and release water at low tides

9. Energy from Wind
• Propeller wind turbines,
on wind farms, can
produce enough energy
for a whole community.
• Only certain areas have
enough wind for this to
succeed (example: Bay
area)