如图所示的电路中,电源电压恒定,开关S闭合,电流表的示数为
,再闭合开关
,电流表的示数为
,若
,则
为( )
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645931095506944/2646798827929600/STEM/3d27c2ad-4c2e-4ed8-92b2-69bb3c2b4865.png?resizew=134)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1ac49b4139636fb1809fe970b23a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910f1655703721b51006b887a2394b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1a0fd1ad044a9ecfcba672779bd678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b5712150472495eef08941c2120ffd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de246c9f0d42e7fbe692aa384e3519a5.png)
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645931095506944/2646798827929600/STEM/3d27c2ad-4c2e-4ed8-92b2-69bb3c2b4865.png?resizew=134)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2021-01-29 22:28:54
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单选题
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较易
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【推荐1】如图所示,以下说法中正确的是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/069c4461-5f4d-479e-866d-902b000dd72f.png?resizew=197)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/069c4461-5f4d-479e-866d-902b000dd72f.png?resizew=197)
A.开关S2控制整个电路 | B.电动机与小灯泡工作时互相影响 |
C.电动机与小灯泡都工作时两端的电压相等 ![]() | D.开关S1、S2都闭合时电动机与小灯泡是串联的 |
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单选题
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较易
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解题方法
【推荐2】如图所示,再闭合开关S1后,电路中变小的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/9d9f192a-b1a4-4183-9aa4-09b1986eaba5.png?resizew=169)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/9d9f192a-b1a4-4183-9aa4-09b1986eaba5.png?resizew=169)
A.电路中的总电阻 | B.电流表Ⓐ的示数 |
C.电阻R1两端的电压 | D.电路消耗的总功率 |
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