电源的电动势和内电阻的测量是高中阶段重要的实验．                               ...

问题详情：

电源的电动势和内电阻的测量是高中阶段重要的实验．                                                

在某次实验中，实验室可以提供的器材有：                                                                 

a．待测电池：电动势E（约3V）、内电阻r（约1Ω）                                                  

b．电流表：量程500μA，内阻为400Ω                                                                        

c．电流表：量程1A，内阻约0.2Ω                                                                              

d．滑动变阻器：阻值0～600Ω，额定电流0.5A                                                           

e．滑动变阻器：阻值0～20Ω，额定电流2.5A                                                             

f．定值电阻7600Ω                                                                                                      

g．定值电阻600Ω                                                                                                       

（1）某实验小组根据实验室提供的器材，设计的实验电路如图所示，根据实验目的和该电路原理图，电路中电流表A1应选择                                                                                                     ，电流表A2     应选择        ，滑动变阻器R1应选择                                                                                                        ，定值电阻R2应选择         （请填写器材前的字母）．

（2）根据实验原理图可以写出电源的电动势和电源内阻的关系为            ，式中各物理量的意义为          ．                                                                                                                                    

【回答】

（1）c；b；e；f；（2）E=8000I2+I1r；I2为电流表A2的读数，II1为电流表A1的读数．

知识点：专题十三 中学物理实验

题型：实验,探究题