Chapter 4 energy luxembourg

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Chapter 4 energy luxembourg

  1. 1. Chapter 4: Energy1. DefinitionEnergy = the ability of a physical system to dowork on other physicalsystemsphysical quantity, abbreviation: E, unit of measurement: J2. Different forms of energychemical energy: decomposing of molecules, digestionthermal energy: reactions in which warmth is set freemechanical energy: energy associated with the motion and position of an objectelectrical energy: energy produced by electricitysee exercise3. Energy sources= all sources delivering energy2 groups:- fossil energy sources: coal, petroleum, natural gas- renewable energy sources: solar, wind, hydroelectric, agriculturalbiomass, geothermal, tidal
  2. 2. 4. Origin of energyPhotosynthesis – see working scheme

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