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1、电子元器件的作用DiagramsandfunctionsofcommonelectroniccomponentsInelectronicmaking,manydifferentelectroniccomponentsareused.Inthissection,youwillbrieflyintroducethecommonlyusedelectroniccomponents・Theroleofthestudentsshouldknowthem,understandthem,remembertheirsymbols,inordertofacilitatethefutureapplication
2、ofthesecomponentsassembleallkindsofusefulandinterestingelectronicproducts.One,resistorandcapacitor(1)resistorWeconnectedthebatteries,switchesandlightswithwirestothe3~1circuit・Whentheswitchcloses,thecurrentisflowingoutofthebattery,theswitchandthelightbulbgotothenegativeelectrode,andthelightbulbshine
3、s.Wiresandlightbulbscanconductelectricity.Theyarecalledconductors・Ingeneral,metalsareconductors.Whenaconductorpassesthroughacurrent,thereisacertainresistancetothecurrent,whichiscalledresistance・ThesymbolforresistaneeisR.Qsizethebasicunitofresistanceistheohm(symbol),andthelargerunitsthousandQ(K),and
4、megohmQ(M).Theirconversionrelationshipis:1mQQQ1k=103=103kQFigure3~1lampcircuitTherearetwomaintypesofresistance・Fixedresistorsarecalledfixedresistors・Avariableresistorisknownasavariableresistor(includinganinvidresistorandpotentiometer)・Theirappearanceandgraphicsymbolsareshownintable3,1.Becauseofdiff
5、erentmaterials,theresistorcanbedividedintocarbonfilmresistance,metalfilmresistance,orwirewoundresistanee,etc・Whatdoestheresistordointhecircuit?Table1commonresistorFixedresistortrimmingresistorpotentiometerRRRWereplacetheswitchinthe3-1circuitwithA470ohmpotentiometer(figure3,1,2(A))・Therotationofther
6、otatingpotentiometer,thebrightnessofthesmallbulbwillchangeastheresistancesareresized・Thebiggertheresistance,thedarkerthelightbulb・Thisshowsthattheresistorcancontrolthestrengthofthecurrentinthecircuit・Wecanusethiscircuittomakeadiiiunerlamp・Figure3-2resistorandcapacitorareusedinthecircuitThemainparam
7、etersoftheresistoraretwo:Nominalandpermissibleerrors・Theresistancevaluelabeledontheresistanceiscalledthenominalresistance・Suchas1・5K,5.1Q.・・Itis.Itsrealvalueallowsacertainerror,nameispermissibleerror,divide
