【7A文】航空电理论航空英文培训课件.ppt

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1、1Electricity-101AirlineTransitionCourse2LessonObjectivesDevelopabasicunderstandingofphysicsrelatedtoElectricalsystemsLookatspecificelectricalcomponentsLearnthebasicoperationofelectricalsystems3ElectricalTheory4ElectricalPhysicsElectricity:theflowofelectronsWhat’sanelect

2、ron?AverysmallparticlethatorbitsthenucleusofanatomWhenoneelectronispassedfromoneatomtoanotherelectricityisproduced5WhydoElectronsFlow?Abalancedatomhasthreeparts:Neutrons:NochargeProtons:PositivelychargedElectrons:NegativelychargedIonspullelectronsoffoftheatomsandleavest

3、hemwithmoreprotonsthanelectrons.Theatomnowholdsapositivechargebecauseoftheunbalanceofelectronsandprotons.Moreprotons(positivelychargedparticles)resultsinapositivecharge.6MoreElectricalKnowledgeConductors:HoldtheirelectronslooselytoallowtheexchangeofelectronsmoreeasilyIn

4、sulators:Holdtheirelectronsmoretightlysoelectronscan’tflowaseasily7MoreElectricalKnowledgeElectromotiveforce:TheforcethatcauseselectronstoflowAgroupofpositivelychargedparticleswouldflowelectronstowardagroupofnegativelychargedparticlesUsuallymeasuredinVoltsElectronFlow:F

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

6、ssure:pressurerequiredtoforceoneampofflowthroughoneohmofresistance,thepotentialelectromotiveforce=1Volt9ElectricalMeasurementResistance:oppositiontocurrentflow,theamountofforcetoallowapressureof1volttoforceaflowof1amp=OhmsPower:1ampofflowunderofpressureofonevolt=1Watt10

7、MagnetismMagnet:isabodythathasthepropertyofattractingironandproducingmagneticfieldsexternaltoitself.Linesofmagneticforce,orFLUX,leavethemagnet’snorthpole,atrightanglestoitssurface,andreenterthemagnet’ssouthpoleinthesamemanor.Ex:theEarth11ElectromagnetsConductivematerial

8、holdingelectricalcurrentwillproduceaninvisiblemagneticfieldaroundthematerial.Whenelectricityissentthroughacoil