6.3 Sources of Energy Mr. Perez

Important Vocabulary Resource Fossil fuels Nonrenewable resource Alternative resource Inexhaustible resource

Energy Resources As we know, the law of conservation of energy states that energy cannot be created nor destroyed, only transformed or converted to another form Most of the energy on Earth comes from the SUN…a small amount of energy comes from radioactive atoms in Earth’s interior

Fossil Fuels Fossil fuels are: Coal, Natural gas, and Oil Radiant Energy (SUN) (Plants/Ocean organisms) Chemical Energy (Fossil fuels) (Burning fossil fuels) Thermal Energy Fossil fuels are: Coal, Natural gas, and Oil Fossil fuels were made by extreme heat and pressure on the remains of once living things after millions of years Natural gas and oil were made from the remains of ocean dwelling organisms Coal was made from the remains of plants that lived on land

Using fossil fuels Fossils fuels are considered a nonrenewable resource because they are used up much faster than they can be replaced. One disadvantage of fossil fuels is that they cause air pollution

Nuclear Energy Energy released from a split atom (fission) is used to heat up water. (THERMAL) The steam is then used to power a generator (MECHANICAL) This generator created electrical energy (ELECTRICAL)

Nuclear Energy Disadvantages: Waste is radioactive and dangerous to environment Amount of uranium in Earth’s crust is nonrenewable

Hydroelectricity Transferring the potential energy in water trapped behind dams and turning it into electrical energy Largest source of renewable energy; an energy source that is replenished regularly Produce NO pollution Disrupts life cycles of aquatic animals

Alternative Sources of Energy Alternative resources are new sources of energy that are safer and cause less harm to the environment Examples include Solar energy- collecting energy from the sun (photovoltaic collectors & solar panels) Wind energy- collecting energy from the wind (wind mills) Geothermal energy- collecting energy from the heat inside Earth’s layers (geothermal reservoirs, heat pumps, power plants) Inexhaustible resources are sources of energy that cannot be used up by humans

Alternative Sources of Energy

Energy from the Oceans Inexhaustible resource that turns mechanical energy to electrical energy using the tides– tidal energy

Conserving Energy

Links http://energy.gov/science-innovation/energy-usage http://www.cpi.coop/my-account/online-usage-calculator/ http://www.neok12.com/diagram/Energy-Sources-01.htm http://www.neok12.com/Energy-Sources.htm

Resources Florida Science Grade 7, Glencoe Science & McGraw Hill Publishing Google image search