在如图示电路中,闭合电键S,当滑动变阻器的滑动触头P向上滑动时,四个理想电表的示数都发生变化,电表的示数分别用I、
、
和
表示,电表示数变化量的大小分别用
、
、
和
表示。下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/2/1/2648599519428608/2652267396284416/STEM/4c9a7c18-6e1a-45e4-a60b-d2fac5481e07.png?resizew=212)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd5f9ecb870fedb5b9a608d9ca2f911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f833a7beb83820ecede0234c671f1878.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1121190db07ad1d64015a3dc4873d65d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8b484849b4e91bc01572c6aff29a56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93bf61180f832bf876a4f75476768aeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2d85e479f17173430549325e76b3dbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829b68852708d428b0aab12f8c73f770.png)
![](https://img.xkw.com/dksih/QBM/2021/2/1/2648599519428608/2652267396284416/STEM/4c9a7c18-6e1a-45e4-a60b-d2fac5481e07.png?resizew=212)
A.I变大,![]() |
B.电源的效率增加 |
C.电源的总功率增加 |
D.![]() ![]() |
更新时间:2021-02-06 15:54:44
|
【知识点】 根据串反并同判断电阻电压和电流的变化
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【推荐1】如图所示的电路中,E为电源电动势,r为电源内阻,
和
均为定值电阻,且阻值与电源内阻相等。
为滑动变阻器,当
的滑动触点在a端时合上开关S,此时三个电表
、
和V的示数分别为
、
和U,电表
、
和V的示数变化量绝对值为
、
和
,将
的滑动触点向b端移动的过程中,下列判断正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/b48b7a15-f04a-4bca-9403-f76c7205b224.png?resizew=219)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14214b574270bb60c53e568c124c1c30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7408f2063b46874fccc1e92c302d1a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58df185308c47c981f6cee7ce202660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58df185308c47c981f6cee7ce202660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34a75c2a392f235c5f07b91d9fb58d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1ac49b4139636fb1809fe970b23a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1a0fd1ad044a9ecfcba672779bd678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34a75c2a392f235c5f07b91d9fb58d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c11166f535f954ae5fbbb94fc5f579a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89386fc089b122f9b30488546d9dffca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22aa57bd256e50068ece901f7cf82bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58df185308c47c981f6cee7ce202660e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/b48b7a15-f04a-4bca-9403-f76c7205b224.png?resizew=219)
A.电源的输出功率一定增加 |
B.电源的效率一定增加 |
C.![]() ![]() ![]() ![]() |
D.![]() |
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【推荐2】如图所示,电源电动势E和内阻r一定,R1、R2是定值电阻,R0是光敏电阻(光敏电阻的阻值随光照强度的增大而减小),L是小灯泡。闭合开关,当照射到R0的光照强度减小时,以下分析正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/5/31/2733121325285376/2733660072509440/STEM/9c1fbb14-4949-46fd-9c00-95be9ce88087.png?resizew=228)
![](https://img.xkw.com/dksih/QBM/2021/5/31/2733121325285376/2733660072509440/STEM/9c1fbb14-4949-46fd-9c00-95be9ce88087.png?resizew=228)
A.电流表示数减小 | B.电压表示数不变 |
C.灯泡亮度变亮 | D.电源效率增大 |
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