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1、初中物理总复习欧姆定律GeneralphysicsreviewinjuniorhighschoolOhm，slaw[thinkingandtraining]Theresistaneeofaresistorwithanelectriccurrentof6voltsisequaltoone,andtheresistanceoftheresistanceis・Ifthevoltageattheendofitis9volts,itsresistanceis,anditscurrentis・Iftheconductorhasnovoltageatbothendsoftheconductor
2、,itscurrentis,anditsresistaneeis・2.Theratioofthetwoisproposed・theoreticalRl,R2=3:2,seriesconnectioncircuit,thanthroughtheircurrentII,12=,thanuponthemattheendsofthevoltageU1:U2二・・・,iftheyareinparallelconnectioncircuit,throughtheircurrentratioforII:12=・3.Therearetworootresistancewire,R1=2,R2=6,
3、puttheminseriesonthe12vpowersupply,istheirtotalresistanceis,thetotalcurrentinthecircuitfor,R1toattheendsofthevoltage,voltageattheendsoftheR2is4.Asshown,keepunchanged6voltpowersupplyvoltage,closingwhenSI,S2isdisconnected,thereadingsof0.26inAtable,VItablereadingsfor2.8v,fromthepowerf1owofelectr
4、iccurrentfor・・・Ann,V2tablenumbershownisv.WhenSIandS2areclosed,thenumberofthevaluesoftheVItableis,andthenumberoftheV2tableis.2.Asshowninthecircuit,powersupplycomposedofthreeseriesdrycell,whenSclosed,Vtablereadingsfor2.5V,thevoltageonbothendsoftheLItoV,L2voltageonbothendsforV:WhenSisbroken,then
5、umberoftheVtableis.ResistorR1=4o,R2=8o,parallelto4voltscircuit,thetotalcurrentisAnn.Togetthetotalcurrentof3,youshouldreplaceR2withan.・・ohmresistanceandR1paralleltothiscircuit・7.Asmalllightbulbworkonbothendsofthevoltageis3v,for18librariesbyfilamentpowerperminute,theresistanceofthefilamentisthe
6、filamentresistance・・・withthetemperatureincreasing・8.ThereisAsmallbulbresistanceis6.3euro,ifusetwoseriesofdrycellpowersupplytoit,tousetworangeammeter(0.6Aand3A)measuredbysmallbulbofcurrent,・・・rangeammeterisusedmoreappropriate.Ifthecurrentof5ohmicresistanceis1,thecurrentof10oresistanceis・Twores
7、istorsR1andR2areinparallel,weknowthatR1isequalto10,R2isequalto40,andthecurrentofR1is2,sothecurrentinR2is・11.TwofixedvalueresistorR1二20euro,R2二40,parallelconnectioncircuitaftertotalresistaneeisthem,bytheircurrentstrengthratioofII,12二.Whichofth
