Sect 17.3
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Sect 17.3

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Sect 17.3 Sect 17.3 Presentation Transcript

  • 6 th Grade Science Chapter 17 Energy and Resources Notes Section 17.3
    • Where does our energy come from?
    • Nearly all the energy used today can be traced to the sun.
    • What are fossil fuels?
    • Fossil fuels are coal, oil and natural gas.
    Key Questions 1
  • Energy Resources
    • The surface of Earth receives energy from two sources—the Sun and radioactive atoms in Earth’s interior.
    • Nearly all the energy you used today can be traced to the Sun, even the gasoline used to power the car or school bus you came to school in.
  •  
  • Coal, oil, and natural gas are fossil fuels. Fossil fuels are a nonrenewable resource because we are using the resource much faster than it is being replaced.
  • Fossil Fuels
    • Coal was formed by similar process from the remains of ancient plants that once lived on land.
  • Using Fossil Fuels
    • Burning fossil fuels to produce energy also generates chemical compounds that cause pollution.
    • Each year billions of kilograms of air pollutants are produced by burning fossil fuels.
    • These pollutants can cause respiratory illness and acid rain.
  • Nuclear Energy
    • To obtain electrical energy from nuclear energy, a series of energy transformations must occur.
    • What is a nonrenewable resource?
    • A nonrenewable resource is an energy source that is used up much faster than it can be replaced.
    • What is a renewable resource?
    • A renewable resource is an energy source that is replenished continually.
    Key Questions 2 The Tadpole Galaxy
  • Hydroelectricity
    • Currently, transforming the potential energy of water that is trapped behind dams supplies the world with almost 20 percent of its electrical energy.
  • Solar Energy
    • The Sun is the origin of almost all the energy that is used on Earth.
    • Because the Sun will go on producing an enormous amount of energy for billions of years, the Sun is an inexhaustible source of energy.
    • An inexhaustible resource is an energy source that can’t be used up by humans.
    • What are examples of alternative resources?
    • Examples of alternative resources are solar energy, wind, and geothermal energy.
    • What is a inexhaustible resource?
    • An inexhaustible resource is an energy source that can’t be used up by humans.
    Key Questions 3 The Sombrero Galaxy
  • Wind
    • Modern windmills convert the kinetic energy of the wind to electrical energy.
    • The propeller is connected to a generator so that electrical energy is generated when wind spins the propeller.
    • Some disadvantages are that windmills produce noise and that large areas of land are needed.
  •  
  • Wind power designs old and new.
  • Using Tidal Energy
    • As the tide comes in, it turns a turbine connected to a generator.
    • When high tide occurs, gates are closed that trap water behind a dam.
    • What is a photovoltaic collector?
    • A photovoltaic collector is a device that transforms radiant energy directly into electrical energy.
    • What is geothermal energy?
    • Geothermal energy is heat energy generated inside the Earth.
    Key Questions 4
  • Collecting the Sun’s Energy
    • A photovoltaic is a device that transforms radiant energy directly into electrical energy.
    • Photovoltaics are used to power calculators and satellites, including the International Space Station .
  •  
  • Geothermal Energy
    • At some places deep within Earth the temperature is hot enough to melt rock.
    • This molten rock, or magma, can rise up and close to the surface through cracks in the crust.
    • In other places, magma gets close to the surface and heats the rock around it.
  • Geothermal Power Plants
  • Conserving Energy
    • One way to make the supply of fossil fuels last longer is to use less energy.
    • Reducing the use of energy is called conserving energy.
    • Diagram the energy conversions that occur when coal is formed, and then burned to produce thermal energy.
    • Explain why solar energy is considered an inexhaustible source of energy.
    • Explain how a heat pump is used to both heat and cool a building.
    • Identify advantages and disadvantages of using fossil fuels, hydroelectricity and solar energy as energy sources.
    Questions Section 17.3