whats energy

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1、CHEMENG4048/7048BIO-FUELS,BIOMASS&WASTESWhatisEnergy?DrPhilipKwongSchoolofChemicalEngineeringUniversityofAdelaideSESSIONOUTCOMESBytheendofthissession,youshouldbeabletodescribeDifferentfundamentalforms/typesofenergyEnergyconversionprocessThemagnitudeofenergyTheefficiencyofdifferent

2、energyconversionsystemWHATISENERGY?Onedefinitionisthecapacitytodowork.Howdoyouknowthatworkhasbeendone?WorkmakesthingsmoveCanyouprovidesomeexamples?WHATISENERGY?Onedefinitionisthecapacitytodowork,tomakesthingsmove.Thermalenergyismakingmolecularparticlesmove(“particles”or“molecularpart

3、icles”=molecules,atoms,ions,incontrasttomacroscopic“objects”)WHATISENERGY?Onedefinitionisthecapacitytodowork,tomakesthingsmove.ThermalenergyismakingmolecularparticlesmoveMechanicalenergyismakingmacroscopicobjectsmoveElectricalenergyismakingelectronsorionsmoveAcousticorsoundenergyis

4、makingmoleculesmoveinanorganisedandperiodicwayWHATISENERGY?Alltheseareexamplesofwhatkindofenergy?Alltheseareexamplesofkineticenergy.Anobjectorparticlehaskineticenergybecauseitismoving.Whatistheothertypeofenergy?WHATISPOTENTIALENERGY?Anobjectorparticlehaskineticenergybecauseitismoving.P

5、otentialenergyisstoredenergythatcanbeconvertedintokineticenergy.WHATISPOTENTIALENERGY?WHATISPOTENTIALENERGY?Potentialenergyisstoredenergythatcanbeconvertedintokineticenergy.GravitationalenergyresultsfromthepositionsofobjectsrelativetotheEarth.(Thecorrespondingforcewecallgravitationalat

6、traction)Electrostaticenergyresultsfromtherelativepositionsofpositiveandnegativeobjectsorparticles.WHATISPOTENTIALENERGY?Potentialenergyisstoredenergythatcanbeconvertedintokineticenergy.Potentialenergyresultsfromthepositionsofmolecularparticlesormacroscopicobjects.Chemicalpotentialener

7、gyresultsfromtherelativepositionsofelectronsandnuclei(Thecorrespondingforceswecallattractionsandrepulsions.Theinteractionsmaybebetweennonpolar,polar,orchargedmolecularspecies)CHEMICALPOTENTIALENERGYAchemicalbondcanbethoughtofasanattractiveforcebetweenatoms.Becauseofthis,atomsandmol