Question

某同學用伏安法測一節(jié)干電池的電動勢E和內電阻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和導線若干                                                                                                      

                                      

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

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

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

                                                                                                                                       

Answer 1

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