【7A文】航空电理论航空英文培训课件.ppt

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1、1Electricity-101AirlineTransitionCourse2LessonObjectivesDevelopabasicunderstandingofphysicsrelatedtoElectricalsystemsLookatspecificelectricalcomponentsLearnthebasicoperationofelectricalsystems3ElectricalTheory4ElectricalPhysicsElectricity:theflowofelectronsW

2、hat’sanelectron?AverysmallparticlethatorbitsthenucleusofanatomWhenoneelectronispassedfromoneatomtoanotherelectricityisproduced5WhydoElectronsFlow?Abalancedatomhasthreeparts:Neutrons:NochargeProtons:PositivelychargedElectrons:NegativelychargedIonspullelectron

3、soffoftheatomsandleavesthemwithmoreprotonsthanelectrons.Theatomnowholdsapositivechargebecauseoftheunbalanceofelectronsandprotons.Moreprotons(positivelychargedparticles)resultsinapositivecharge.6MoreElectricalKnowledgeConductors:Holdtheirelectronslooselytoall

4、owtheexchangeofelectronsmoreeasilyInsulators:Holdtheirelectronsmoretightlysoelectronscan’tflowaseasily7MoreElectricalKnowledgeElectromotiveforce:TheforcethatcauseselectronstoflowAgroupofpositivelychargedparticleswouldflowelectronstowardagroupofnegativelychar

5、gedparticlesUsuallymeasuredinVoltsElectronFlow:FrompositivetonegativeAreaofExcessElectrons(NegativeCharge)AreaofElectronDeficiency(PositivelyCharged)8ElectricalMeasurementQuantity:thecoulomb(culom)isthebasicunitofelectronflow,1coulomb6.28x1018That’s6,280,000

6、,000,000,000,000electronsFlow:1coulombpersecond=oneAmperePressure:pressurerequiredtoforceoneampofflowthroughoneohmofresistance,thepotentialelectromotiveforce=1Volt9ElectricalMeasurementResistance:oppositiontocurrentflow,theamountofforcetoallowapressureof1vol

7、ttoforceaflowof1amp=OhmsPower:1ampofflowunderofpressureofonevolt=1Watt10MagnetismMagnet:isabodythathasthepropertyofattractingironandproducingmagneticfieldsexternaltoitself.Linesofmagneticforce,orFLUX,leavethemagnet’snorthpole,atrightanglestoitssurface,andree

8、nterthemagnet’ssouthpoleinthesamemanor.Ex:theEarth11ElectromagnetsConductivematerialholdingelectricalcurrentwillproduceaninvisiblemagneticfieldaroundthematerial.Whenelectricityissentthroughacoil