為了測量量程為3V的電壓表V的內(nèi)阻(內(nèi)阻約2000Ω),實(shí)驗(yàn)室可以提供的器材有:                       

電流表A1,量程為0.6A,內(nèi)阻約0.1Ω                                                                             

電壓表V2,量程為5V,內(nèi)阻約3500Ω                                                                             

變阻器R1阻值范圍為0﹣9999Ω                                                                                      

變阻箱R2阻值范圍為0﹣99.9Ω                                                                                       

滑動(dòng)變阻器R3,最大阻值約為100Ω,額定電流1.5A                                                       

電源E,電動(dòng)勢6V,內(nèi)阻約0.5Ω                                                                                    

單刀單擲開關(guān)K,導(dǎo)線若干.                                                                                          

                            

(1)請從上述器材中選擇必要的器材,設(shè)計(jì)一個(gè)測量電壓表V的內(nèi)阻的實(shí)驗(yàn)電路,在圖1方框中畫出電路原理圖  (    電路原理圖中的元件要用題中相應(yīng)的英文字母標(biāo)注),要求測量盡量準(zhǔn)確.                

(2)根據(jù)你所畫的電路原理圖在圖2所給的實(shí)物圖上畫出連線.                                   

(3)說明實(shí)驗(yàn)所要測量的量:                                                                           .寫出計(jì)算電壓表V的內(nèi)阻RV的計(jì)算公式為RV=                                                                                                               

                                                                                                                                       


(1)(2)(3)電壓表V的示數(shù)U、電壓表V2的示數(shù)U2、電阻箱R1的讀數(shù)r1,電壓表的內(nèi)阻為Rv=


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