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Doyouoftengowithyourmotheronweekends?shop
如图所示R1=20Ω闭合开关电压表和电流表的示数分别为6V和0.5A．求1通过电阻R1的电流．2电阻R2的阻值．
—What'sthewithBob? —Hestayedinfromofthecomputerinthesamewayfortoolongandnowhefeelsterrible.
---yourfamilywithyouinBeijing?---Notheyaren’t. A.Is B.Are C.Do D.Does
Don'tgotoschoolwithanemptyinthemorning.Youmusteatsomething. A.hand B.mouth C.Stomach D.head
—What'syourtrouble?Youdon'tlookverytoday. —Ihaveabadcold. A.good B.better C.well D.worse
小华同学为了探究电流与电阻的关系设计了如图甲的实验电路她在学校实验室找来了如下一些实验器材电压恒为3V的电源电流表电压表各一只一个开关阻值分别为10Ω20Ω50Ω的定值电阻各一个滑动变阻器上标有20Ω1A字样导线若干．1小华连接好电路闭合开关后移动滑变阻器滑片时发现电流表指针正常偏转电压表示数为零则发生这种故障的原因可能是．2故障排除后小华先把10Ω的电阻接入电路移动滑变阻器滑片使电压表示数为2V读出电流表示数后断开开关她直接拆下10Ω的电阻改换成阻值为20Ω的电阻继续做实验闭合开关电压表示数如图丙所示其示数是V要完成这次实验接下来她应将变阻器滑片向选填左或右端移动使电压表的示数为V．3当小华改用50Ω的电阻继续实验时发现无论怎样移动滑动变阻器滑片都无法使电压表示数达到实验要求的值你认为电压表的示数无法达到实验要求的值的原因可能是A．滑动变阻器的阻值太大 B．电压表量程选小了C．滑动变阻器的阻值太小 D．滑动变阻器烧坏了
如图所示电源保持6V的电压不变开关S闭合后电流表的示数是0.4A电压表的示数为2V则电阻R1的阻值是Ω将滑动变阻器R2的滑片由a向b移动的过程中电流表的示数将电压表的示数将两空选填变大变小或不变．
Asmalldoglieonthegroundjustnow.Itatesomemeatthere.
ShanghaiisbiggerthancityinChina. A.theother B.other C.another D.anyother
Ican'tsleep.IlistentoexcitingmusicandIlistentoexcitingmusic. A.should;should B.shouldn't;shouldn't C.should;shouldn't D.can;don't
一根铝导线电阻是R要使连入电路的导线电阻变大可采取的办法是
IatetoomuchjunkfoodlastnightandnowIhavea.
在如图5所示电路中电源电压不变当滑动变阻器的滑片P由右端向中点移动时下列说法正确的是
--WhereMrBlackusuallyexercise? --Inthepark?Lookheruninthepark.
小薇和小亮两位同学在探究电流与电压的关系的实验中电源使用两节新干电池滑动变阻器R的规格是20Ω2A．1如图甲所示是小薇画出的电路图小亮进行实物图连线如图乙所示请你在虚线框内把电路图补画完整要求所补画的元件与实物电路对应．2开关闭合前小亮发现电流表的指针在零刻度线左端如图丙所示其原因是选填A或BA．电流表没调零 B．电流表正负接线柱接反了3确认电路无误后闭合开关进行实验第4次实验时电流表示数为0.5A电压表示数如图丁所示记为V他们记录的数据如下表所示老师指出其中一组数据有拼凑的嫌疑你认为是第组填写实验序号理由是4排除有拼凑嫌疑的数据后分析数据可以得到的结论是在不变时通过导体的电流与导体两端的电压成比5小薇利用实验数据还计算出定值电阻R的阻值为Ω结果保留一位小数
Wherepeoplelikeawalk?.A.aretotake B.doestaking C.istake D.dotaking
It’saphotomyfamily.Therearefourpeoplemyfamily. A.ofin B.within C.forin D.ofat
Mr.Wangwashitbyacarbecausehewentacrossthestreetwithoutlookatthetrafficlights.
Maryisn'tabookbutshe'sTV.A.seeingreading B.readingwatching C.readingseeing D.lookingwatching
Don'tworry.Shecantakecareofyourpet.A.carefulenough B.enoughcarefulC.enoughcarefully D.carefullyenough
Marylikecomputergames?A.Isplaying B.Doesplay C.DoesplayingD.Istoplay
Sometimesmylittlebrotherbecauseheisverylazy. A.doeshishomework B.doesn’thishomework C.doesn’tdohishomework D.dohishomework
Youhaveahigh.Thetemperatureis39°.
Mygrandfatherenjoyswithhisoldfriendsonweekends.Nowheistalkingthephone.A.talkin B.talkingin C.talkingon D.totalkon
There'sorangejuiceinthebottle. A.toomanyB.toomuch C.manytoo D.muchtoo
DearTom It'sSundaytoday.It's8:00intheeveninghere.I'mwritingtotellyousomethingaboutmyfamily.MyfatheriswatchingCCTVnews.That'shisfavoriteshow.Mymotherislisteningtothemusic.Shelikesmusicverymuch.MyfriendDickistakingthehattome.Hewantsmetoputitonandgooutforawalkwithhim.Whatacleverdog!Mylittlebrotherisplayingtoysandheishappy.Icanhearthenoiseofbusesandcarsfromthewindow.Therearemanyboysplayingsoccer. Whatareyourfamilydoing?Iknowthattimethereisearly.WhattimeisitinNewYork?Areyougettingup?Pleasewritetomesoon.Bestwishes. Yours John 1.WhoisDick? 2.What'sJohndoingnow? 3.Isfatherlisteningtothemusic? 4.WhereisTomlivingnow? 5.WhatdoesDickwantJohntodo?
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