【7A文】航空电理论航空英文培训课件.ppt

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1、1Electricity-101AirlineTransitionCourse2LessonObjectivesDevelopabasicunderstandingofphysicsrelatedtoElectricalsystemsLookatspecificelectricalcomponentsLearnthebasicoperationofelectricalsystems3ElectricalTheory4ElectricalPhysicsElectricity:theflowofelectronsWhat’sanelectro

2、n?AverysmallparticlethatorbitsthenucleusofanatomWhenoneelectronispassedfromoneatomtoanotherelectricityisproduced5WhydoElectronsFlow?Abalancedatomhasthreeparts:Neutrons:NochargeProtons:PositivelychargedElectrons:NegativelychargedIonspullelectronsoffoftheatomsandleavesthemw

3、ithmoreprotonsthanelectrons.Theatomnowholdsapositivechargebecauseoftheunbalanceofelectronsandprotons.Moreprotons(positivelychargedparticles)resultsinapositivecharge.6MoreElectricalKnowledgeConductors:HoldtheirelectronslooselytoallowtheexchangeofelectronsmoreeasilyInsulato

4、rs:Holdtheirelectronsmoretightlysoelectronscan’tflowaseasily7MoreElectricalKnowledgeElectromotiveforce:TheforcethatcauseselectronstoflowAgroupofpositivelychargedparticleswouldflowelectronstowardagroupofnegativelychargedparticlesUsuallymeasuredinVoltsElectronFlow:Fromposit

5、ivetonegativeAreaofExcessElectrons(NegativeCharge)AreaofElectronDeficiency(PositivelyCharged)8ElectricalMeasurementQuantity:thecoulomb(culom)isthebasicunitofelectronflow,1coulomb6.28x1018That’s6,280,000,000,000,000,000electronsFlow:1coulombpersecond=oneAmperePressure:pres

6、surerequiredtoforceoneampofflowthroughoneohmofresistance,thepotentialelectromotiveforce=1Volt9ElectricalMeasurementResistance:oppositiontocurrentflow,theamountofforcetoallowapressureof1volttoforceaflowof1amp=OhmsPower:1ampofflowunderofpressureofonevolt=1Watt10MagnetismMag

7、net:isabodythathasthepropertyofattractingironandproducingmagneticfieldsexternaltoitself.Linesofmagneticforce,orFLUX,leavethemagnet’snorthpole,atrightanglestoitssurface,andreenterthemagnet’ssouthpoleinthesamemanor.Ex:theEarth11ElectromagnetsConductivematerialholdingelectri

8、calcurrentwillproduceaninvisiblemagneticfieldaroundthematerial.Whenelectricityissentthroughacoil