浙江工商大学公共管理学院

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1、ELECTROMAGNETISMELECTROMAGNETISM?????ELECTROMAGNETISMTHEBRANCHOFPHYSICSTHATDEALSWITHTHERELATIONSHIPBETWEENELECTRICITY&MAGNETISMMAGNETICPHENOMENONELECTROMAGNETISMDAVY’SEXPERIMENTOERSTED’SEXPERIMENTANYCHARGEINMOTIONCREATESMAGNETICFIELDMOVINGELECTRONSINDUCEMAGNETICFIELD

2、DETERMININGTHEDIRECTIONOFTHEMAGNETICFIELDAROUNDCURRENTCARRYINGCONDUCTORTHUMB-DIRECTIONOFELECTRONSFLOWFINGERS—MAGNETICFLUXLINESCOILOFWIREISCALLEDHELIXCOILOFWIRECARRYINGELECTRICALCURRENTISCALLEDSOLENOIDSOLENOID’SMAGNETICFIELDELECTROMAGNET=SOLENOID+IRONCOREELECTROMAGNETE

3、LECTROMAGNETvsSOLENOIDELECTROMAGNETSOLENOIDELECTROMAGNETICINDUCTION:ANELECTRICCURRENTISINDUCEDININACIRCUITIFSOMEPARTOFTHISCIRCUITISINACHANGINGMAGNETICFIELDE.M.INDUCTIONSTATIONARYCONDUCTOR+MOVINGMAGNETSTATIONARYMAGNET+MOVINGCONDUCTORELECTROMAGNETWITHA/CCURRENT+STATIONA

4、RYCONDUCTORSTATIONARYMAGNETMOVINGMAGNETMOVINGMAGNETELECTROMAGNETWITHA/CMETALDETECTORFARADAY’SLAWMAGNITUDEOFINDUCEDCURRENTDEPENDSONTHESTRENGTHOFMAG.FIELDTHEVELOCITYOFMAG.FIELDTHEANGLEOFTHECONDUCTORTOTHEMAG.FIELDTHENUMBEROFTURNSINTHECONDUCTORSPEEDFAST–E.M.FANGLEANGLE–

5、E.M.#OFCOILSSTRONGERWEAKERLEFTHANDDYNAMORULENSeELECTRONFLOWDIRECTIONDIRECTIONOFeDIRECTIONOFeELECTRICGENERATOR(DYNAMO)—ADEVICETHATCONVERTSMECHANICALENERGYTOELECTRICALENERGYBYE.M.INDUCTIONGENERATORCOMPONENTSAPOWERFULMAGNETANARMATURE(WIRELOOP)GENERATORSD/CA/CD/CGENERATOR

6、COMMUTATORRINGD/CPOWERFROMBATTERYITIMEA/CGENERATORA/CFREQUENCYINTHEUS–60HzELECTRICMOTOR-ADEVICETHATCONVERTSELECTRICALENERGYTOMECHANICALENERGYTYPESOFMOTORSD/C(COMMUTATORRING!!)A/CD/CMOTORA/CMOTORSSYNCHRONOUS(REVERSEOFGENERATOR)INDUCTIONINDUCTIONMOTORROTATESTHEANODEINTH

7、EMODERNX-RAYTUBESINDUCTIONMOTORROTORSTATORPRINCIPLEOFOPERATIONRIGHTHANDMOTORRULECOMPARISON–GENERATORvsMOTOR