某同學(xué)用伏安法測一節(jié)干電池的電動勢E和內(nèi)電阻r,所給的其它器材有:                         

A.電壓表V:0~3~15V                                                                                                

B.電流表A:0~0.6~3A                                                                                                

C.變阻器R1:(20Ω,1A)                                                                                            

D.變阻器R2:(1000Ω,0.1A)                                                                                      

E.電鍵S和導(dǎo)線若干                                                                                                      

                                      

(1)實驗中電壓表應(yīng)選用的量程為                                                              (填0~3V或0~15V);電流表應(yīng)選用的量程為                                                                                                           填0~0.6A或0~3A);變阻器應(yīng)選用        ;

(2)根據(jù)實驗要求連接實物電路圖(圖1);                                                                  

(3)實驗測得的6組數(shù)據(jù)已在U﹣I圖2中標(biāo)出,如圖2所示.請你根據(jù)數(shù)據(jù)點位置完成U﹣I圖線,并由圖線求出該電池的電動勢E=                                                                                                  V,電阻r= Ω.           

                                                                                                                                       


(1)0~3V;0~0.6A;R1;(2)電路圖如圖所示;(3)1.5;0.50.


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