首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
如图,已知电源电压为24V,R2上标有“100Ω 3A”的字样,灯泡上标有“12V 3W”的字样,电流表A1的量程为0~0.6A,电流表A的量程为0~3A. (1)求灯泡正常工作时的电阻; (2...
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
有三个电阻串联于电路中已知R1=15ΩR2=30ΩR3=5Ω且已知 电源电压为110V流经电阻上的电
33、55、11V
22、66、11V
33、66、11V
33、66、22V
如图所示已知R1与R2两端所加电压为24V如果R1=80Ω开关闭合后R2中的电流为0.2A则R2=_
由电阻R1=1ΩR2=2ΩR3=3Ω组成的并联电路如果电路两端的总电压U为24V则流过电阻R3的电流
如图所示R1=10欧R2=20欧R3=40欧U=24V求电流I1I2I3.
在一个电源电压为24V的电路中R1=2ΩR2=8Ω试求电路串联和并联的电流是多少
如图已知电源电压为24VR.2上标有100Ω3A的字样灯泡上标有12V3W的字样电流表A1的量程为0
如图所示已知E1=18Vr1=1Ωr2=1ΩE4=10V各电阻R1=4ΩR2=2ΩR3=6Ω电压表的
2013•长沙小刚设计了一种小鸡孵化器的电路模型如图所示在一般情况下只需灯光照明温度较低时则需要加热
如图所示电路中灯泡L1上标有24V8WL2上标有24V16W电源电压恒为24V闭合开关后
电流表A
1
和A
2
的示数相同
电流表A
1
的示数是1A
电流表A
2
的示数是0.5A
电压表的示数是12V
电源电压为12V将电阻R1和R2串联到电路中已知R1的阻值约为R2的2~3倍用电压表和电流表分别测R
如图7所示电路电源两端电压为U=4.5V且保持不变电阻R1=10滑动变阻器R2的铭牌上标有201A的
电压表V2示数范围为0~3V
电流表A.的示数范围为0.15~0.45A
滑动变阻器R2的阻值取值范围为5~15
电阻R1的电功率取值范围为0.225~0.9W
两个电阻上都标有3V字样其电阻分别为R1和R2它们的电流随电压变化关系如图4所示有
电阻R1的额定功率为0.36W
电阻R2的阻值为0.72?
若把电阻R1和R2并联在电源电压为2V的电路中工作,则电阻R2的实际功率是0.12W
若把电阻R1和R2串联在电源电压为3V的电路中工作,则两电阻均能正常工作
图4
如图甲所示电路R1为定值电阻滑动变阻器R2铭牌上标有10Ω2A字样电源电压不变闭合开关S.在ab端移
如图7所示电路电阻R1标有6ΩlAR2标有3Ω1.2A电流表
1、A.2的量程均为0~3A,电压表量程0~15V,在a、b间接人电压可调的直流电源.闭合开关s后,为保证R1、R2均不损坏,则允许加的电源电压和通过电流表A.1的电流不得超过( )A.9V 1A
3.6V 1.8A
9.6V lA
3.6V 0.6A
某物理兴趣小组的同学们为自己的房间设计了一种冬天取暖的电路模型如图所示只闭合开关S.灯泡L.发光发热
如图所示电路中灯泡L1上标有24V8WL2上标有24V16W电源电压恒为24V闭合开关后
电流表A
1
和A
2
的示数相同
电压表的示数是12V
电流表A
2
的示数是0.5A
电流表A
1
的示数是1A
如图所示的电路中电源电压恒为24V电阻R1的阻值为20Ω滑动变阻器R2上标有100Ω3A字样闭合开关
图甲的电路中电源电压恒为12V滑动变阻器的铭牌上标有100Ω0.5A字样图乙为R1的I-U图像R1的
有三个电阻串联于电路中已知R1=15R2=30R3=5且已知电源电压为110V流经电阻上的电流
33、55、11V;
22、66、11V;
33、66、11V;
33、66、22V
有一继电器其工作电压为6V线圈电阻R2=200Ω电源电压为24V只要串联的降压电阻R1为时可 使继电
200Ω
400Ω
600Ω
800Ω
热门试题
更多
2008年北京奥运会的比赛门票开始接受公众预定.下表为北京奥运会官方票务网站公布的几种球类比赛的门票价格某球迷准备用12000元预定15张下表中球类比赛的门票 1若全部资金用来预定男篮门票和乒乓球门票问这个球迷可以预订男篮门票和乒乓球门票各多少张 2若在准备资金允许的范围内和总票数不变的前提下这个球迷想预定上表中三种球类门票其中足球门票与乒乓球门票数相同且足球门票的费用不超过男篮门票的费用问可以预订这三种球类门票各多少张
Alwaysbelievethatsmileattheworldtheworldwillsmilebacktoyou. A.and B.or C.as D.though
InJanuary2016athree﹣episodeTVdocumentaryMastersinForbiddenCitywasbroadcastonChinaCentralTelevision.Itsoonbecamepopular﹣thefirstepisodealonehasbeenwatchednearly1milliontimessofaronthevideowebsitebilibili.com. NowthedocumentaryhasbeenmadeintoafilmandcameoutonDec162016.Itisabouthowprofessionalantiquityrestorers文物修复者intheForbiddenCityrepairancientpaintingscalligraphyclocksandbronzepieces.Itmaynotsoundexcitingbuttherestorers'patienceandtheir100percentfocusoneventhesmallestthingsisenoughtoimpresspeople. Infactmanyoftherestorersareyoungpeople.Ithasalsomadethedocumentarypopularamongtheirpeers同龄人asithasshownthempossibilityofadifferentlifestyle.AfterMastersinForbiddenCitywasbroadcastabout20000peopleappliedtoworkintheForbiddenCity.Mostofthemwerenewcollegegraduates. Thejobhasbecomepopular.Sohavetherestorers.Butwasitdifficulttobepartofadocumentary?Itwasonlysupposedtobedifficultforthedirectornotforus.Wesimplydidourjobspayingnoattentiontoanyoneelsearound.saidShiLiancangoneoftherestorerswhenaskedduringthefilm'spremiere首映inShanghai.Tomakethedocumentarytheproductionteamalsodidfiveyearsofpre﹣researchandfourmonthsofuninterrupted连续的filmingintheForbiddenCity. Indeedtheserestorerskeepthispeacefulstateofmindanddevotethemselvestodoingthesamethingtheydeeplylovedayafterday.AstheposterforthedocumentarysaysChooseacareeranddoitforalifetime. 28.WhatdoesthedocumentaryMastersinForbiddenCitymainlytalkabout? A.DetailedintroductionsofthingsintheForbiddenCity. B.HowrestorersintheForbiddenCityrepairthings. C.LifeofprofessionalantiquityrestorersintheForbiddenCity. D.DifferentkindsofworkersworkingintheForbiddenCity. 29.FromwhatShiLiancangsaidinparagraph4themostimportantqualityoftherestorersshouldbe. A.curiosity B.creativity C.imagination D.attention 30.Whatdoesthedocumentarywanttotellpeople? A.Chooseajobyouloveanddoitwell. B.Workingasanantiquityrestorerisgreat. C.Youngpeopleshouldliveadifferentlife. D.ShootingafilmintheForbiddenCityrequireshardwork.
It'snevertoooldtolearn.KarlMarxbegantolearnEnglishinhis.A.thefiftieth B.fiftieth C.fifty D.fifties
计算2cos30°﹣|﹣1|+﹣1.
已知如图①②在矩形ABCD中AB=4BC=8PQ分别是边BCCD上的点. 1如图①若AP⊥PQBP=2求CQ的长 2如图②若且EFG分别为APPQPC的中点求四边形EPGF的面积.
把多项式8a3﹣2a分解因式的结果是.
抛物线y1=ax2+bx+c与直线y2=mx+n的图象如图所示下列判断中①abc<0②a+b+c>0③5a﹣c=0④当x<或x>6时y1>y2其中正确的个数有
Whenyousetoutonyournewjourneyyoushouldn'tforgetyoucamefrom. A.where B.what C.when D.if
已知如图在△ABC中AB=AC点P是底边BC上一点且满足PA=PB⊙O是△PAB的外接圆过点P作PD∥AB交AC于点D. 1求证PD是⊙O的切线 2若BC=8tan∠ABC=求⊙O的半径.
下列几何体中主视图和左视图都为矩形的是
ThemainreasonIwasalittlenervoustogotoInnerMongoliawasthatIdidn'treallyknowwhattoexpect.HoweverIwasinterestedinthehorseridingarcheryanddeliciousfoodthatIhadheardabout. AlsomyfriendandIwouldbetravellingthereandsleepinginatraditionalMongolianyurtwithcompletestrangers.Iwasworriedaboutthisnewanddifficultexperience. Assoonaswegottothegrasslandsafterourlongfive﹣hourjourneybycarweweregreetedwithsteamingbowlsofheartyMongoliannoodles﹣justwhatweneededtogetusinthemoodtoexplore.Wetookawalkaroundthegrasslandsandweresurprised﹣notonlybytheirbeautybutalsobythestrongwindsthatblewdirtintoourhairandnearlyknockedusoffourfeet. Beforelongitwastimetogohorseriding.IwasworriedbecauseitwasthefirsttimeIhadeverriddenahorse.Ididn'tneedtoworrythough﹣wewereallbeginnersbutthehorsesmadeitveryeasyforus.Howevertheydidhaveahabitofturningaroundandgoingtheotherwayfornoreason! Intheeveningweateanothersimpledeliciousmealofroastlamb.Afterwardswehadastrangetask﹣tocollectdung粪便tomakeafire.Intheendwehadagreattimearoundthecampfirethateveninglisteningtomusicandsharingstoriesofourdaywithstrangers.Thatwasthemostexcitingpartofourtrip. Thenwewenttosleepinouryurt.Becausewewereinthegrasslandsthetemperaturedroppedsharplyatnighttoaroundzerosowefeltcoldthroughoutthenighteventhoughsixotherpeopleweresleepingwithus. ThenextdaywewokeupstillfeelingtiredandheadedbacktoHohhotcapitalofInnerMongoliaautonomousregion.Wereallylovedthenicehotelroomwesleptinthatnightandtheshowerthatwashedthedirtoutofmyhair.Howeverwedidn'tregrethavingtheadventureintheInnerMongoliangrasslands. 36.Howdidthewriterfeelbeforethetrip? A.Hefeltnervousaboutexperiencingnewthings. B.Hehadmixedfeelingsaboutthecomingtrip. C.Hecouldn'twaittogoonanadventureintotheunknown. D.Hefeltworriedabouttravellingwithcompletestrangers. 37.ThewriterexperiencedmanythingsinInnerMongoliaEXPECT. A.sleepingintheopenair B.horseriding C.makingafire D.listeningtomusicandsharingstories 38.WhichofthefollowingstatementsisTRUEaccordingtothearticle? A.Thewriterdidnotexpectthewindtobesohard. B.Roastlambwasthewriter'sfavouriteMongolianfood. C.Thewriterthoughtthatcollectingcowdungwasveryunpleasant. D.Sleepingwithothersmadethenightfeellesscoldtothewriter. 39.Whatcanwelearnaboutthewriter'shorseridingexperience? A.Thehorseshadprobablybeentrainedwell. B.Horseridingwasthemostexcitingpartofthewriter'strip. C.Thewriterwaswellpreparedforhishorseridingexperience. D.Thewriter'shorsekeptturningaroundbecausehedidn'tknowhowtocontrolit. 40.Thewriterwrotethisarticlemainlyto. A.showthatitwasthedifficultpartsthatmadehistripgreat B.describewhatInnerMongoliaisreallyliketoreaders C.tellreaderstobebraveandexploretheunknown D.shareaninterestingtravelexperience
一个袋子中装有3个红球和2个黄球这些球的形状大小质地完全相同在看不到球的条件下随机从袋子里同时摸出2个球则这2个球的颜色相同的概率是.
如图在平行四边形ABCD中AB<BC. 1利用尺规作图在BC边上确定点E使点E到边ABAD的距离相等不写作法保留作图痕迹 2若BC=8CD=5则CE=.
在△ABC中AB=13cmAC=20cmBC边上的高为12cm则△ABC的面积为cm2.
小明在测小灯泡电功率实验中电路图如图甲所示电源电压为8V小灯泡L的额定电压为2.5V正常发光时的电阻约为10Ω可供选用的滑动变阻器R1R2和R3的最大阻值分别为5Ω20Ω50Ω.1为了保证元件安全应该选用的滑动变阻器是选填R1R2或R3.2图乙是根据实验数据绘制的U—I关系图象.由此可知小灯泡的额定功率是W.当滑动变阻器的滑片向左移动时灯丝的电阻将3小明继续向左移动滑片小灯泡发出刺眼的光然后突然熄灭电流表示数变为零那么产生此故障的原因是
下列运算中正确的是
ThevisitorenjoyedsheinXuanwuLakelastweek.
Forthepastfiveyears44﹣year﹣oldRamiAdhamhasspentmuchofhistimehelpingchildreninSyria叙利亚.Hekeepssending16tothem. RamiAdhamwasborninSyriabutmovedtoFinlandwithhisfamilyin1989.WhenSyriancivilwar内战tookplacein2011hedecidedtohelpthechildreninhishometown.Inthebeginninghe17plannedonsendingtoys.Hethoughtfoodmedicineanddrinkingwaterweremore18.OncehisdaughteraskedhimtosendhertoystothechildreninSyria.WhenAdhamgavethetoystothosepoorchildrenhesawthe19ontheirfaces.Fromthenonhemadetoysonthetopofhisgiftlist. Adhamsoonbecamefamous20theFatherChristmasofSyria.HehastravelledfromFinlandtoSyria28times.Andhewon'tstop21thewarends.EverytimehegoestoSyriahecarriesaheavybagoftoysonhisbackallhisway.It'satripfullof22.Hemightgethurtorbekilledatanytimebuthenevergivesup.NowchildreninSyriaarefacingdeathandmanyotherpossiblethreats.Ithinkthetoysarereally23forthechildrenhesaid.Nomatterwhatthey24theyarealwayshappytosharethemwithothers. Adhamishavingafund﹣raisingactivityatpresent.Hewantstoraise100000dollars.Ifitis25heplanstousethemoneytobuildschoolsinSyria.TheworkofAdhamisalightamongthedarknessformanychildreninSyria. 16.A.food B.toys C.money D.medicine 17.A.never B.sometimes C.often D.always 18.A.impolite B.impatient C.important D.impossible 19.A.joy B.sadness C.anger D.fear 20.A.for B.with C.as D.to 21.A.when B.though C.after D.until 22.A.secrets B.safety C.danger D.happiness 23.A.expensive B.valuable C.useless D.hopeless 24.A.remember B.record C.receive D.remind 25.A.necessary B.interesting C.difficult D.successful
﹣Hello!I'dliketospeaktotheCustomerServiceDepartment. ﹣PleaseholdandI'llyourcalltoit. A.lookthrough B.putthrough C.runthrough D.gothrough
NowChinaisplanningitsown国家的parksystemtoprotectthegiantpandaSiberiantigerandAmurleopard.
如图在一次军事演习中蓝方在一条东西走向的公路上的A处朝正南方向撤退红方在公路上的B处沿南偏西60°方向前进实施拦截红方行驶1000米到达C处后因前方无法通行红方决定调整方向再朝南偏西45°方向前进了相同的距离刚好在D处成功拦截蓝方求拦截点D处到公路的距离结果不取近似值.
﹣CouldyouhelpmedosomecleaningJason? ﹣Certainly.MomwillbecrazyifsheseesthisIthink. A.mess B.menu C.market D.message
﹣MissWhiteIamafraidIhavegotlowmarksintheexam. ﹣dear!Takeiteasy.Iamsureifyoutryyourbestyouwillpassiteasilynexttime. A.You'rewelcome B.Comeon C.Allright D.Welldone
某公司今年销售一种产品一月份获得利润10万元由于产品畅销利润逐月增加一季度共获利36.4万元已知2月份和3月份利润的月增长率相同.设23月份利润的月增长率为x那么x满足的方程为
如图OA=AB∠OAB=90°双曲线y=经过点A双曲线y=﹣经过点B已知点A的纵坐标为﹣2则点B的坐标为.
1如图1在矩形ABCD中对角线AC与BD相交于点O过点O作直线EF⊥BD且交AD于点E交BC于点F连接BEDF且BE平分∠ABD. ①求证四边形BFDE是菱形 ②直接写出∠EBF的度数. 2把1中菱形BFDE进行分离研究如图2GI分别在BFBE边上且BG=BI连接GDH为GD的中点连接FH并延长FH交ED于点J连接IJIHIFIG.试探究线段IH与FH之间满足的关系并说明理由 3把1中矩形ABCD进行特殊化探究如图3矩形ABCD满足AB=AD时点E是对角线AC上一点连接DE作EF⊥DE垂足为点E交AB于点F连接DF交AC于点G.请直接写出线段AGGEEC三者之间满足的数量关系.
国家规定“中小学生每天在校体育活动时间不低于1小时”.为此某市就“你每天在校体育活动时间是多少”的问题随机调查了辖区内300名初中学生.根据调查结果绘制成的统计图部分如图所示其中分组情况是 A组t<0.5hB组0.5h≤t<1hC组1h≤t<1.5hD组t≥1.5h 请根据上述信息解答下列问题 1C组的人数是 2本次调查数据的中位数落在组内 3若该辖区约有24000名初中学生请你估计其中达国家规定体育活动时间的人约有多少
Manystudentsdidn't意识到theimportanceofstudyuntiltheyleftschool.
WhenyoutravelabroadyoucanhardlyavoidproductsmadeinChina. A.tobuy B.buy C.buying D.bebought
热门题库
更多
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库