如图所示的电路中,闭合开关后,滑动变阻器的滑动触头向左移动时,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/1/23/2642508556713984/2644264903475200/STEM/ceec6d7c-d1f1-4fa0-8a36-f4fb176c34e4.png)
![](https://img.xkw.com/dksih/QBM/2021/1/23/2642508556713984/2644264903475200/STEM/ceec6d7c-d1f1-4fa0-8a36-f4fb176c34e4.png)
A.电压表示数不变 | B.电容器带电量增加 |
C.灯泡变暗 | D.电流表示数变小 |
更新时间:2021-01-26 08:33:37
|
【知识点】 含容电路中有关电荷量及其变化的计算
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单选题-单题
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【推荐1】如图所示,电源电动势
,内电阻
,变阻器
的最大电阻
,
,
,平行板电容器
的两金属板水平放置。开关
与
接触,电路稳定后( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/1d1fcaac-b649-4605-83f2-640af0b540ad.png?resizew=175)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7efde4c14ed8ac0b7973066aa7b9ee0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9812a60d8f29a90c0b485e6ecda28d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10897c19ec7069766bdbb4c68ac55374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be7e1d42feb90a2852a866b6ab2317bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd6a0754cf906d8feb817f3ea2407602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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A.电源的最大输出功率为![]() |
B.![]() |
C.![]() ![]() |
D.当开关接向![]() ![]() ![]() |
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【推荐2】在如图所示的电路中,闭合开关,将滑动变阻器的滑片向左移动电路稳定后,与滑片移动前比较()
![](https://img.xkw.com/dksih/QBM/2019/3/9/2156625008836608/2158054723280897/STEM/d5e69392-5a7b-487b-b507-46f88adf3e31.png?resizew=253)
![](https://img.xkw.com/dksih/QBM/2019/3/9/2156625008836608/2158054723280897/STEM/d5e69392-5a7b-487b-b507-46f88adf3e31.png?resizew=253)
A.电阻R0两端电压变大 |
B.电容器C上的电荷量不变 |
C.电源消耗的总功率变小 |
D.灯泡L变亮 |
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