Question

某同学用伏安法测一节干电池的电动势E和内电阻r，所给的其它器材有：                         

A．电压表V：0～3～15V                                                                                                

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

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

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

E．电键S和导线若干                                                                                                      

                                      

（1）实验中电压表应选用的量程为                                                              （填0～3V或0～15V）；电流表应选用的量程为                                                                                                           填0～0.6A或0～3A）；变阻器应选用        ；

（2）根据实验要求连接实物电路图（图1）；                                                                  

（3）实验测得的6组数据已在U﹣I图2中标出，如图2所示．请你根据数据点位置完成U﹣I图线，并由图线求出该电池的电动势E=                                                                                                  V，电阻r= Ω．           

                                                                                                                                       

Answer 1

（1）0～3V；0～0.6A；R₁；（2）电路图如图所示；（3）1.5；0.50．