resistor 电阻

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1、实用标准文案ResistorFromWikipedia,thefreeencyclopediaJumpto:navigation,searchAtypicalaxial-leadresistorPartiallyexposedTeslaTR-2121kΩcarbonfilmresistorAxial-leadresistorsontape.Thetapeisremovedduringassemblybeforetheleadsareformedandthepartisinsertedintotheboard.Threecarboncompositionresi

2、storsina1960svalve(vacuumtube)radio文档实用标准文案Aresistorisatwo-terminalelectroniccomponenthavingaresistance(R)thatproducesavoltage(V)acrossitsterminalsthatisproportionaltotheelectriccurrent(I)throughitinaccordancewithOhm'slaw:V=IRResistorsareelementsofelectricalnetworksandelectroniccirc

3、uitsandareubiquitousinmostelectronicequipment.Practicalresistorscanbemadeofvariouscompoundsandfilms,aswellasresistancewire(wiremadeofahigh-resistivityalloy,suchasnickel-chrome).Theprimarycharacteristicsofaresistoraretheresistance,thetolerance,themaximumworkingvoltageandthepowerratin

4、g.Othercharacteristicsincludetemperaturecoefficient,noise,andinductance.Lesswell-knowniscriticalresistance,thevaluebelowwhichpowerdissipationlimitsthemaximumpermittedcurrent,andabovewhichthelimitisappliedvoltage.Criticalresistanceisdeterminedbythedesign,materialsanddimensionsofthere

5、sistor.Resistorscanbeintegratedintohybridandprintedcircuits,aswellasintegratedcircuits.Size,andpositionofleads(orterminals),arerelevanttoequipmentdesigners;resistorsmustbephysicallylargeenoughnottooverheatwhendissipatingtheirpower.Contents[hide]·1Units·2Theoryofoperationo2.1Ohm'slaw

6、o2.2Seriesandparallelresistorso2.3Powerdissipation·3Constructiono3.1Leadarrangementso3.2Carboncompositiono3.3Carbonfilmo3.4Thickandthinfilmo3.5Metalfilmo3.6MetalOxidefilmo3.7Wirewound文档实用标准文案o3.8Foilresistoro3.9Ammetershuntso3.10Gridresistoro3.11Specialvarieties·4Variableresistorso4

7、.1Adjustableresistorso4.2Potentiometerso4.3Resistancedecadeboxeso4.4Specialdevices·5Measurement·6Standardso6.1Productionresistorso6.2Resistancestandards·7Resistormarkingo7.1Four-bandresistorso7.2Preferredvalueso7.35-bandaxialresistorso7.4SMDresistorso7.5Industrialtypedesignation·8El

8、ectricalandthermaln