如图所示,闭合电路中电源电动势为E、内阻为r,
(
)为定值电阻,当滑动变阻器
的滑片从a端滑向b端时,理想电压表V1、V2、V3的示数变化量的绝对值分别为
、
、
,下列判断正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/38bc8258-47c1-46e2-bec7-21d81550cfbd.png?resizew=184)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a4991c61dd5c01ff98d5f72ecfee0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f22f4cbd25d37e07a7d774d03f7792.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ea866b1d2fac02cb4ce747c384d8d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30afc01cb0272aab38ce372a596335e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/38bc8258-47c1-46e2-bec7-21d81550cfbd.png?resizew=184)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2022-12-15 20:53:01
|
【知识点】 利用局部→整体→局部的方法分析动态电路
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【推荐1】如图所示的电路,当开关S1断开,S2与1接通时,灯泡L1最亮,灯泡L2和L4的亮度相同,且最暗,当开关S2与2接通、S1闭合时,不计灯泡阻值变化,则( )
![](https://img.xkw.com/dksih/QBM/2021/7/20/2768391736647680/2768498164170752/STEM/ace8fba4-c9c6-484c-b789-581304eeed29.png?resizew=199)
![](https://img.xkw.com/dksih/QBM/2021/7/20/2768391736647680/2768498164170752/STEM/ace8fba4-c9c6-484c-b789-581304eeed29.png?resizew=199)
A.电源的总功率减小 |
B.L3和L4的亮度不变 |
C.L1最亮,L4最暗 |
D.L1最暗,L4比L2亮 |
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【推荐2】如图所示的电路中,两平行金属板之间的带电液滴处于静止状态,电流表和电压表均为理想电表,由于某种原因灯泡L的灯丝突然烧断,其余用电器均不会损坏,开关始终处于闭合状态,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/b2611d13-8205-4b32-a7a7-b4736a5ad11e.png?resizew=281)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/b2611d13-8205-4b32-a7a7-b4736a5ad11e.png?resizew=281)
A.电流表、电压表的读数均变小 |
B.电源内阻消耗的功率变大 |
C.液滴将向上运动 |
D.电源的输出功率变大 |
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