为了描绘标有“3V，0.4W”的小灯泡的伏安特*曲线，要求小灯*两端电                    ...

问题详情：

为了描绘标有“3V，0.4W”的小灯泡的伏安特*曲线，要求小灯*两端电                              

压能从零开始变化．所给器材如下：                                                                             

A．电流表（0～200mA，内阻0.5Ω）                                                                            

B．电流表（0～0.6A，内阻0.01Ω）                                                                              

C．电压表（0～3V，内阻5kΩ）                                                                                   

D．电压表（0～15V，内阻50kΩ）                                                                               

E．滑动变阻器（0～10Ω，0.5A）                                                                                 

F．电源（3V）                                                                                                              

G．电键一个，导线若干．                                                                                            

（1）实验中所用电流表和电压表应选用                                                                 

（2）在方框中画出实验电路图1．                                                                                

（3）考虑到金属电阻率与温度的关系，图2中能较正确反映通过小灯泡的电流I与灯泡两端的电压U之间的变化关系的是                                                                                                       ．                     

【回答】

（1）AC

（2）如图

（3）A

知识点：专题十三 中学物理实验

题型：实验,探究题