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1、Unit2SemiconduetordeviceLesson3ResistorCapacitorInductor《电了技术专业英语教程》冯新宇主编电子工业出版社HFW.phei.coin,cnLesson3ResistorCapacitorInductorBackgroundsTexttourLanguageinuse-VocabularyStructure-Reading/writingtechniquesBackgroundsTerminology一Resistor一Capacitor-InductorFour-bandresistorsInduetanccformulae
2、TerminologyResistorResistancemaybethoughtofasanoppositiontocurrentflow;thehighertheresistancethelowerthecurrentthatwillflow.•电阻可以被认为对电流具有一种阻碍作用,电阻越高所流过的电流越低。ResistorTheresistanceofanelectricalconductordependson4factors,thesebeing:(a)Thelengthoftheconductor.Resistance,R,isdirectlyproportional
3、tolength,1,ofaconductor,i.e.R^l.(b)Thecrosssectionalareaoftheconductor.Resistance,R,isinverselyproportionaltocrosssectionalarea,a,ofaconductor,i.e.R^l/a.(c)Thetypeofmaterial.(d)Thetemperatureofthematerial・Resistor•导体的电阻依赖以下四个因素:•(a)导体长度。电阻R正比于导体长度1,即R乞1•(b)导体横截面积。电阻R反比于导体的横截面积％即R*l/a■G材料类型■(
4、d)材料温度。Capacitor•Themaintypesofthecapacitorinclude:variableair,mica,paper,ceramic,plastic,titaniumoxideandelectrolytic.•电容的主耍类型包括:可变间隙电容,云母电容,纸电容,陶瓷电容,塑料电容,二氧化钛电容以及电解质电容。Inductor•Aniron-coredinductorisoftencalledachokesince,whenusedina.c.circuits,ithasahokingeffect,limitingthecurrentflowingt
5、hroughit.•一个有铁芯的电感器我们通常把它称之为扼流圈,这主耍是因为在交流电路中它具有阻塞效应,可以限制流过它的电流。Four-bandresistorsFour-bandidentificationisthemostcommonlyusedcolor-codingschemeonresistors.Itconsistsoffourcoloredbandsthatarepaintedaroundthebodyoftheresistor.Thefirsttwobandsencodethefirsttwosignificantdigitsoftheresistanceval
6、ue,thethirdisapower—of—tenmultiplierornumber~of-zeroes,andthefourthisthefirstthreebandstoleranceaccuracy,oracceptableerror,ofthevalue.Theareequallyspacedalongtheresistor;thespacingtothefourthbandiswider.Sometimesafifthbandidentifiesthethermalcoefficient,butthismustbedistinguishedfromthetrue5
7、~colorsystem,with3significantdigits.Color1stband2ndband3rdband(multiplier)4thband(tolerance)Temp.CoefficientBlack0Brownx101±1%(F)100ppmRed±2%(G)50ppmOrange15ppmYellow25ppmGreenBlueVioletGray±0.5%(D)±0.25%(C)d£l.1%(B)±0.05%(A)WhiteSilverxW2土⑴％(K)Non
