如图,电源电压恒定不变,
,闭合开关S、
,电流表示数为
,再闭合开关S2,调节
,使电流表示数为
,则此时变阻器
的阻值为______
。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfcd0ba05362781df538a801ae470173.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d43eb0b274e00cbbc4a210da4165042.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af0c75782ea31248ed96108f17373b62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db586f2c37b26089713ff02346e6d0d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/0348d372-e841-4049-8ab7-14e2db6beb30.png?resizew=107)
更新时间:2024-02-27 01:31:01
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【推荐1】如图所示电源电压保持不变,当开关
闭合,甲、乙两表为电压表时,两表的示数之比
,则灯泡
、
的电压![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5b0b00f041cb2dc51aa0e8992dfd5b.png)
________ ;当开关
断开,甲、乙为电流表时,若两表指针位置相同,则通过灯泡
、
的电流![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5c43b76d48cdb737f49ccc926d14da7.png)
_______ 。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e1ba6fa269046d29f2a5ad375e3cbfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5b0b00f041cb2dc51aa0e8992dfd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5c43b76d48cdb737f49ccc926d14da7.png)
![](https://img.xkw.com/dksih/QBM/2021/10/12/2827773433954304/2833013196144640/STEM/f23a6fc3-66f7-4713-bb81-012faaa69b8b.png?resizew=170)
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【推荐2】如图所示,电源电压为3V,
,
,
。只闭合S3,电压表的示数为______ V;只闭合S1、S2、S3,电流表示数为______ A。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfcd0ba05362781df538a801ae470173.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d851f5baa57f3be4a7cdab413d0c37f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2796d5266f4e5f1d594a8098b000ef8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/ca5e96d2-dcea-49c5-a868-f9b6d8b635af.png?resizew=202)
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【推荐1】将“
”的灯泡甲和“
”的灯泡乙串联在电路中,较亮的是______ 灯;要保证两灯都不损坏,电源电压应否超过______ V(假设灯丝电阻不受温度影响)。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ea8f3f633a796a1492e486f8b17d85f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3b3ca8367665e063368a710fee9ece.png)
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【推荐2】一盏标有“6V 3W”字样的小灯泡,接入电压为9V的电路中,若使灯泡正常发光,则需______ 联一个阻值为______ Ω的电阻。
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