如图所示电路中,电源的内电阻为r,R1、R3、R4均为定值电阻,电表

如图所示电路中,电源的内电阻为rR1R3R4均为定值电阻,电表均为理想电表.闭合电键S,滑动变阻器R2的滑片向右滑动,电流表和电压表示数变化量的大小分别为DIDU下列结论正确的是      

A电压表示数变大     B电流表示数变大  Cr        Dr[

 

 

 

 

 

 

 

答案

AD

相关题目

解不等式组
解不等式组
已知双曲线的焦距为26,且,则双曲线的标准方程是A.=1     
已知双曲线的焦距为26,且,则双曲线的标准方程是A.=1                                                B.=1C.=1             
三峡水利枢纽工程是化水害为水利的著名工程。中国先民兴
三峡水利枢纽工程是化水害为水利的著名工程。中国先民兴建的下列工程中也具有这一特点的是                            A.都江堰   
 ―Hello! May I speak to Jack, please?    ―Yes, speaking.    ―Oh, I
 ―Hello! May I speak to Jack, please?    ―Yes, speaking.    ―Oh, I _________ your voice at first.   A. don’t recognize                            B. didn’t recognize
--Chinese Voice is the most popular programme, I think. -- That’s true. But n
--Chinese Voice is the most popular programme, I think. -- That’s true. But not _________ likes it, I’m afraid. A. everyone     B. no one     C. someone     D. anyone
当x       时,分式有意义;当x = _____ 时,分式值为0.
当x       时,分式有意义;当x = _____ 时,分式值为0.
---I`ll be away for a visit to the History Museum .Would you mind going with me
---I`ll be away for a visit to the History Museum .Would you mind going with me ?    ---______. A. I`ll like it  B.No, I`ve no time C.Not at all ,I`d be glad to  D.Yes ,of course
今有①盐酸、②醋酸、③硫酸三种稀溶液,用序号回答下列
今有①盐酸、②醋酸、③硫酸三种稀溶液,用序号回答下列问题。 (1)若三种酸的物质的量浓度相等。 a.取等体积上述三种溶液,分别用同浓度的NaOH溶

最新题目