Light and electricity
What is Energy? It is the ability to do work. It moves vehicles, lights and  heats our home and even makes our bodies grow.
Forms of Energy: Light Sound Heat Electricity
Renewable energy sources Solar energy (sun) Wind energy Geothermal energy Biomass (plants) Hydropower (water)
Non-renewable sources Petrol Coal Oil Natural gas Nuclear
Some types of energy: Solar Power    Chemical energy
Light This is an energy called electromagnetic radiation. When light passes through a prism, it separates into a spectru...
Light Properties  Reflection       Refraction
Tools to control and detect light Telescope Microscope Binoculars Cameras
Energy and electricity Oil, gas and coal are PRIMARY sources of energy.  Electricity is a SECONDARY source of energy. We...
Matter Matter is made of atoms. Atoms are made of  electrons, protons and neutrons. When electrons move along wires, ele...
Conductors Materials that allow electricity to flow, like metals, are  called CONDUCTORS.
Insulators Materials that don’t allow electricity to pass, like  rubber and plastic, are called INSULATORS.
Using energy Energy cannot be created or destroyed, but it can be transformed into other types of energy: - Batteries int...
Uses of Energy Industry: heat for steam or hot water, factories for  cooking, drying etc. Transportation: gasoline, dies...
Clean energy Non-renewable sources of energy like coal, oil and  natural gas cause air pollution. Renewable energy like ...
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Units 7 and 8, energy

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Units 7 and 8, energy

  1. 1. Light and electricity
  2. 2. What is Energy? It is the ability to do work. It moves vehicles, lights and heats our home and even makes our bodies grow.
  3. 3. Forms of Energy: Light Sound Heat Electricity
  4. 4. Renewable energy sources Solar energy (sun) Wind energy Geothermal energy Biomass (plants) Hydropower (water)
  5. 5. Non-renewable sources Petrol Coal Oil Natural gas Nuclear
  6. 6. Some types of energy: Solar Power  Chemical energy
  7. 7. Light This is an energy called electromagnetic radiation. When light passes through a prism, it separates into a spectrum of colours called a rainbow.
  8. 8. Light Properties  Reflection  Refraction
  9. 9. Tools to control and detect light Telescope Microscope Binoculars Cameras
  10. 10. Energy and electricity Oil, gas and coal are PRIMARY sources of energy. Electricity is a SECONDARY source of energy. We transform other sources of energy to make electricity. Electricity is transformed in power plants.
  11. 11. Matter Matter is made of atoms. Atoms are made of electrons, protons and neutrons. When electrons move along wires, electricity is produced.
  12. 12. Conductors Materials that allow electricity to flow, like metals, are called CONDUCTORS.
  13. 13. Insulators Materials that don’t allow electricity to pass, like rubber and plastic, are called INSULATORS.
  14. 14. Using energy Energy cannot be created or destroyed, but it can be transformed into other types of energy: - Batteries into light energy. - Electrical energy on phone into sound energy.
  15. 15. Uses of Energy Industry: heat for steam or hot water, factories for cooking, drying etc. Transportation: gasoline, diesel, electricity, gas, etc. for vehicles. Public and residential use: electricity and gas for heating and lighting in offices, hospitals, schools and homes.
  16. 16. Clean energy Non-renewable sources of energy like coal, oil and natural gas cause air pollution. Renewable energy like sunlight, wind or water is good. It replaces itself and doesn’t cause pollution.

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