【7A文】航空电理论航空英文培训课件.ppt

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1、1Electricity-101AirlineTransitionCourse2LessonObjectivesDevelopabasicunderstandingofphysicsrelatedtoElectricalsystemsLookatspecificelectricalcomponentsLearnthebasicoperationofelectricalsystems3ElectricalTheory4ElectricalPhysicsElectricity:theflowofelectronsWhat’sanelectron?Averysmallp

2、articlethatorbitsthenucleusofanatomWhenoneelectronispassedfromoneatomtoanotherelectricityisproduced5WhydoElectronsFlow?Abalancedatomhasthreeparts:Neutrons:NochargeProtons:PositivelychargedElectrons:NegativelychargedIonspullelectronsoffoftheatomsandleavesthemwithmoreprotonsthanelectron

3、s.Theatomnowholdsapositivechargebecauseoftheunbalanceofelectronsandprotons.Moreprotons(positivelychargedparticles)resultsinapositivecharge.6MoreElectricalKnowledgeConductors:HoldtheirelectronslooselytoallowtheexchangeofelectronsmoreeasilyInsulators:Holdtheirelectronsmoretightlysoelect

4、ronscan’tflowaseasily7MoreElectricalKnowledgeElectromotiveforce:TheforcethatcauseselectronstoflowAgroupofpositivelychargedparticleswouldflowelectronstowardagroupofnegativelychargedparticlesUsuallymeasuredinVoltsElectronFlow:FrompositivetonegativeAreaofExcessElectrons(NegativeCharge)Ar

5、eaofElectronDeficiency(PositivelyCharged)8ElectricalMeasurementQuantity:thecoulomb(culom)isthebasicunitofelectronflow,1coulomb6.28x1018That’s6,280,000,000,000,000,000electronsFlow:1coulombpersecond=oneAmperePressure:pressurerequiredtoforceoneampofflowthroughoneohmofresistance,thepoten

6、tialelectromotiveforce=1Volt9ElectricalMeasurementResistance:oppositiontocurrentflow,theamountofforcetoallowapressureof1volttoforceaflowof1amp=OhmsPower:1ampofflowunderofpressureofonevolt=1Watt10MagnetismMagnet:isabodythathasthepropertyofattractingironandproducingmagneticfieldsexterna

7、ltoitself.Linesofmagneticforce,orFLUX,leavethemagnet’snorthpole,atrightanglestoitssurface,andreenterthemagnet’ssouthpoleinthesamemanor.Ex:theEarth11ElectromagnetsConductivematerialholdingelectricalcurrentwillproduceaninvisiblemagneticfieldaroundthematerial.Whenelectricityissentthrough

8、acoil