有一待測(cè)的電阻器Rx,其阻值約在40~50Ω之間,實(shí)驗(yàn)室準(zhǔn)備用來(lái)測(cè)量                   

該電阻值的實(shí)驗(yàn)器材有(圖1):                                                                                

電壓表V(量程0~10V,內(nèi)電阻約20kΩ)                                                                

電流表A1(量程0~500mA,內(nèi)電阻約20Ω)                                                            

電流表A2(量程0~300mA,內(nèi)電阻約4Ω)                                                             

滑動(dòng)變阻器R1(最大阻值為10Ω,額定電流為2A)                                                  

滑動(dòng)變阻器R2(最大阻值為250Ω,額定電流為0.1A)                                              

直流電源E(電動(dòng)勢(shì)為9V,內(nèi)電阻約為0.5Ω)                                                          

電鍵及若干導(dǎo)線                                                                                                         

實(shí)驗(yàn)要求電表讀數(shù)從零開始變化,并能多測(cè)出幾組電流、電壓值,以便畫出I﹣U圖線.            

a.電流表應(yīng)選用                                                                                                        .(選填器材代號(hào))

b.滑動(dòng)變阻器選用                                                                                                     .(選填器材代號(hào))

c.請(qǐng)?jiān)诜娇騼?nèi)畫出實(shí)驗(yàn)電路圖(圖2),并將右圖中器材連成符合要求的電路.        

        

                                                                                                                                 


(a)A2  (b)R1  (c)見(jiàn)上圖


練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目:高中物理 來(lái)源: 題型:


電子以初速度v0沿垂直場(chǎng)強(qiáng)方向射入兩平行金屬板中間的勻強(qiáng)電場(chǎng)中,現(xiàn)增大兩板間的電壓,但仍使電子能夠穿過(guò)平行板間,則電子穿越平行板所需要的時(shí)間

A.隨電壓的增大而減小             B.隨電壓的增大而增大

C.加大兩板間距離,時(shí)間將減小     D.與電壓及兩板間距離均無(wú)關(guān)

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


一短跑運(yùn)動(dòng)員在百米比賽中跑到50m時(shí)速度的大小是9.5m/s,在12s末沖刺時(shí)的速度大小是11.5m/s.求這名運(yùn)動(dòng)員在百米賽程中平均速度的大。                                                                                             

                                                                                                                                   

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


如圖所示,厚薄均勻的矩形金屬薄片邊長(zhǎng)ab=2bc,當(dāng)將A與B接入電路或?qū)與D接入電路中時(shí)電阻之比RAB:RCD為(   )                                                                                                                         

                                                                                                         

    A. 1:4          B.                         1:2                        C. 2:1       D. 4:1

                                                                                                                                 

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


如圖甲是某一點(diǎn)電荷形成的電場(chǎng)中的一條電場(chǎng)線,A、B是電場(chǎng)線上的兩點(diǎn),一負(fù)電荷q僅在電場(chǎng)力作用下以初速度v0從A運(yùn)動(dòng)到B過(guò)程中的速度圖線如圖乙所示,則以下說(shuō)法中正確的是(    )         

                                                                                                         

    A.  此電場(chǎng)一定是正電荷形成的電場(chǎng)

    B.  A、B兩點(diǎn)的電場(chǎng)強(qiáng)度是EA<EB

    C.  A、B兩點(diǎn)的電勢(shì)是φA>φB

    D.  負(fù)電荷q在A、B兩點(diǎn)的電勢(shì)能大小是EpA>EpB

                                                                                                                                 

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


在如圖所示的電路中,已知電源電動(dòng)勢(shì)E=3V,內(nèi)電阻r=1Ω,電阻R1=2Ω,滑動(dòng)變阻器R的阻值可連續(xù)增大,問(wèn):                                                                                                                               

(1)當(dāng)R多大時(shí),R消耗的功率最大?最大功率為多少?當(dāng)R消耗功率最大時(shí)電源的效率是多少?        

(2)當(dāng)R多大時(shí),R1消耗的功率最大?最大功率為多少?                                       

(3)當(dāng)R為多大時(shí),電源的輸出功率最大?最大為多少?                                        

                                                                                                         

                                                                                                                                 

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


如圖所示是電場(chǎng)中某區(qū)域的電場(chǎng)線分布,a、b是電場(chǎng)中的兩點(diǎn),則(           )                               

                                                                                                   

    A.  電荷在a點(diǎn)受到電場(chǎng)力方向必定與場(chǎng)強(qiáng)方向一致

    B.  同一點(diǎn)電荷放在a點(diǎn)受到的電場(chǎng)力比放在b點(diǎn)時(shí)受到電場(chǎng)力小

    C.  正電荷放在a點(diǎn)靜止釋放,在電場(chǎng)力作用下運(yùn)動(dòng)的軌跡與電場(chǎng)線一致

    D.  a點(diǎn)的電場(chǎng)強(qiáng)度較大

                                                                                                                                     

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


如圖所示,AB、CD為一圓的兩條直徑且相互垂直,O點(diǎn)為圓心.空間存在一未知靜電場(chǎng),場(chǎng)強(qiáng)方向與圓周所在平面平行.現(xiàn)有一電子,在電場(chǎng)力作用下(重力不計(jì)),先從A點(diǎn)運(yùn)動(dòng)到C點(diǎn),動(dòng)能減少了W;又從C點(diǎn)運(yùn)動(dòng)到B點(diǎn),動(dòng)能增加了W,那么關(guān)于此空間存在的靜電場(chǎng)可能是(     )                                                    

                                                                                                             

    A.  方向垂直于AB并由O指向C的勻強(qiáng)電場(chǎng)

    B.  方向垂直于AB并由C指向O的勻強(qiáng)電場(chǎng)

    C.  位于O點(diǎn)的正點(diǎn)電荷形成的電場(chǎng)

    D.  位于D點(diǎn)的正點(diǎn)電荷形成的電場(chǎng)

                                                                                                                                     

查看答案和解析>>

科目:高中物理 來(lái)源: 題型:


在雜技表演中,猴子沿豎直桿向上做初速度為零、加速度為a的勻加速運(yùn)動(dòng),同時(shí)人頂著直桿以速度v0水平勻速移動(dòng),經(jīng)過(guò)時(shí)間t,猴子沿桿向上移動(dòng)的高度為h,人頂桿沿水平地面移動(dòng)的距離為x,如圖所示.關(guān)于猴子的運(yùn)動(dòng)情況,下列說(shuō)法中正確的是(                                                                 )                                                

                                                                                                       

    A.  相對(duì)地面的運(yùn)動(dòng)軌跡為直線

    B.  相對(duì)地面做變加速曲線運(yùn)動(dòng)

    C.  t時(shí)間內(nèi)猴子對(duì)地的位移大小為

    D.  t時(shí)刻猴子對(duì)地速度的大小為v0+at

                                                                                                                                      

查看答案和解析>>

同步練習(xí)冊(cè)答案