1. Resources
&
Supplying Our
Energy Needs
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2. Supplying Our Energy Needs
 Electricity is made in a power plant.
 Most power plants burn fossil fuels (natural resources
like coal, oil, or natural gas) to produce heat.

3. Supplying Our Energy Needs
 Next, this heat is used to boil water.
 The steam from the boiling water turns a turbine.
 The turbine turns a generator which produces electricity.
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4. Electricity from Fossil fuels
 A nonrenewable resource is not replaced as it is used.
 Because it takes so long for these resources to form,
someday we will not have enough fossil fuels to produce
the electricity we need.
 The three major fossil fuels are coal, oil, and natural gas.
Coal Oil Natural Gas

6. Electricity from Nuclear energy
 The main advantage of using nuclear energy to produce
electricity is that it doesn’t pollute the air like fossil fuel
power plants do.
 Storage of nuclear waste has always been a major
disadvantage of nuclear power plants.
 Uranium fuel from the reactor stays
dangerously radioactive for a long time.
Coal
Power plant

7. Electricity from Renewable
resources
 A renewable resource can be replaced naturally in a
relatively short period of time.
 The Sun and wind are renewable resources that can be used
as energy sources.

8. Electricity from Renewable
resources
 It is also possible to use:
 Moving water (hydroelectric)
 Hot spots near Earth’s surface (geothermal)
 Fuels made from once-living things like wood or corn
(called biomass) or
 Tides to produce electricity.
Hydroelectric Power plant Geothermal Power Plant Biomass power Plant

11. Transportation & Energy
 Americans use about 375 million gallons of gasoline
every day.
 The U.S. does not produce enough crude oil to make all
of the gasoline used by American motorists.

12. Transportation and energy
 If a machine is efficient, the machine is able to use most
of its energy source to do a job.
 Only about 20% of the gasoline energy in a car is
converted to motion.
 Almost 80% the energy is lost as unusable heat.

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The End