Download Chapter Eighteen: Renewable Energy

CHAPTER EIGHTEEN:
RENEWABLE ENERGY
Section One: Renewable Energy Today

Renewable Energy

energy from sources that are constantly being formed
 Solar
Energy
 Wind Energy
 Biomass
 Hydroelectricity
 Geothermal Energy
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
Section One: Renewable Energy Today

Wind Power
 Converts
the
mechanical movement
of wind to electricity
 Wind farms have
many windmills
 Underdeveloped
resource
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

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
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
Section Two: Alternative Energy and
Conservation

Alternative Energy
 Energy
 Tidal
sources that are still in development
power
 Ocean thermal energy
 Hydrogen
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
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
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
Section Two: Alternative Energy
Conservation

Energy Conservation
 Saving
energy
 Cities can enact
energy saving plans
 People can used
technology in their
homes to save energy