Unit 5 energy alberto s
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Unit 5 energy alberto s

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Unit 5 energy alberto s Unit 5 energy alberto s Presentation Transcript

  • Energy By Alberto fernández fernández
  • What is energy • Energy is the ability of an object to change things around it . • Energy can be mechanical, ligth, sound, thermal, electrical, chemic al or nuclear
  • Sources of energy • Sources can be : • Renewable : such as water , wind , sun , biomass , waves and tides
  • • Non-renewable :Fuels are sources of chemical of energy . Coal , natural gas , and petroleum are fuels . • Uranium and plutonium are sources of thermal energy .
  • Energy transforms • The speakers change the electricity into sound . • The waves and tides change mechanical energy into electricity .
  • Electricity • Electricity is a form of energy : • We can transport it easily through power lines . • It trasforms into other types of energy , the light energy of a light bulb
  • Electrical charges • Static electricity, it occurs when an object acumulates electrical charge .
  • Conducting and insulating materials • Electrical charges move easily through conducting materials . • Electrical charges cannot move through insulating materials like wood , rubber and plastic .
  • Electrical current . Electrical current is the movement of the electrical charges through a conducting material . ELECTRIC CIRCUIT The elements in a electric circuit are :
  • The generator
  • The conductor
  • The light bulb
  • Producing electricity HIDROELECTRIC POWER STATIONS : Use the energy from the reservoirs . Water moves a turbine and its generates electricity
  • • NUCLEAR POWER STATIONS : Use uranium or plutonium to produce thermal energy
  • • THERMAL POWER STATIONS: Burn fuels . Combustion heats water that is converted into steam . Steam moves a turbine and generates electricity
  • • WIND FARMS AND SOLAR POWER STATIONS : transform the wind and the sun energy .
  • Energy and the enviroment Producing and using energy causes problems . • Changes in the landscape . The construction of reservoirs changes the landscape
  • • Depletion . Fuels are non-renewable sources of energy and they can run out .
  • • Pollution . The burning of fuels produces gases that pollute the air
  • Using energy efficiently • Turn off the ligths
  • • Use public transport .
  • • Turn off the heaters and air conditioning when its possible . Insulate homes .
  • • Practise the 3 R `s : reduce , reuse and recycle .
  • Magnetism Magnetism is the ability of materials to attract metals such as iron and steel . There are two types of magnets , natural or artificial .
  • Uses of magnets • Magnets are used in door locks , bags … • Magnetism are used to store information on credit cards
  • Electromagnetism • Elctricity produces magnetism . • Magnetism produces elctricity .
  • • When the wheel turns , the magnet inside the dynamo turns and it creates an electrical current .
  • THE END