关于图1、2中各物理量的关系有以下的描述
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773766061834240/1773766062129152/STEM/1b5c8273-0ecb-43fc-8d22-5dd481c7ec57.png)
(1)![](https://img.xkw.com/dksih/QBM/2017/7/28/1773766061834240/1773766062129152/STEM/81501f167aea4603a30fbf706b74a795.png)
(2)![](https://img.xkw.com/dksih/QBM/2017/7/28/1773766061834240/1773766062129152/STEM/312b19983b60491c9719792623ce0ab8.png)
(3)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33f7c5f89a99466325109d6e4692d42d.png)
(4)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5f33fa86dd1323aeff89f185941950.png)
正确的是( )
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773766061834240/1773766062129152/STEM/1b5c8273-0ecb-43fc-8d22-5dd481c7ec57.png)
(1)
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773766061834240/1773766062129152/STEM/81501f167aea4603a30fbf706b74a795.png)
(2)
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773766061834240/1773766062129152/STEM/312b19983b60491c9719792623ce0ab8.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33f7c5f89a99466325109d6e4692d42d.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5f33fa86dd1323aeff89f185941950.png)
正确的是( )
A.(2)、(4) | B.(1)、(2) |
C.(3)、(4) | D.(1)、(3) |
更新时间:2017-09-14 11:19:12
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【推荐1】为了使一只电阻为10Ω、正常工作的电压为6V的电灯接在24V的电源上能正常工作,那么电路中必须
A.串联一只30Ω的电阻 | B.串联一只10Ω的电阻 |
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【推荐2】如图所示是电阻
的电压-电流关系图像,下列说法中( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/d8d2b423-5a0e-4b0d-8509-67dbfddbdafd.png?resizew=140)
①电阻
和
的阻值之比是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
②电阻
串联,当电流为
时,
两端总电压为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d64b26bd3eaeebadf07fef49e260282.png)
③电阻
并联到
电压下,干路中的电流是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c5c631f2750511e61b1fbcca001dd5.png)
④电阻
两端电压为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46cfcb890869761aa705eb0441e45018.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/d8d2b423-5a0e-4b0d-8509-67dbfddbdafd.png?resizew=140)
①电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
②电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46cfcb890869761aa705eb0441e45018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e3bca0725df91ac9ff5d1d999096ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46cfcb890869761aa705eb0441e45018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d64b26bd3eaeebadf07fef49e260282.png)
③电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46cfcb890869761aa705eb0441e45018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88866e31275955fd69b6ffa120d3d898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c5c631f2750511e61b1fbcca001dd5.png)
④电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef412f9f9a6ca89bc145417e89134a4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c5db93dfe8fda0ef4c47b2506ec80a3.png)
A.只有①②正确 | B.只有③④正确 | C.只有②④正确 | D.只有②③正确 |
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【推荐1】小明同学按图甲所示的电路进行实验,已知电源由四节新干电池组成。闭合开关S后,电流表A1和A2的指针均指在图乙所示的位置。下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/7f0b1ee4-452b-481c-a809-ca8c139211bd.png?resizew=460)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/7f0b1ee4-452b-481c-a809-ca8c139211bd.png?resizew=460)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/19265c9d-db26-4b6f-9bb6-69b916ee9ab5.png?resizew=268)
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D.交换电压表和电流表A2的位置,闭合S,电压表有示数,两个电流表均无示数 |
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【推荐1】如图,电源电压保持不变,闭合开关,当滑动变阻器的滑片P向左滑动时,下列判断正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/3e01e604-73db-4fe9-bc11-00eb6dc398d0.png?resizew=110)
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A.18V 10Ω | B.18V 20Ω | C.12V 20Ω | D.12V 10Ω |
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