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1 . 如图所示,理想变压器原、副线圈的匝数比为
,a、b两点间的电压为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f244346cf6f7b8c9cd974dd7fd4abb33.png)
,R为可变电阻,P为用铅锑合金制成的保险丝,其电阻可忽略不计,熔断电流为2A.为使保险丝不熔断,可变电阻R连入电路的最小阻值是
![](https://img.xkw.com/dksih/QBM/2018/7/7/1983129472671744/1983987933224960/STEM/54101876-665e-48be-9579-608443a26e80.png?resizew=364)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef788f59b4f155f215c36ea0ac3695f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f244346cf6f7b8c9cd974dd7fd4abb33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/771bf45b27581396ec270e65abb18eca.png)
![](https://img.xkw.com/dksih/QBM/2018/7/7/1983129472671744/1983987933224960/STEM/54101876-665e-48be-9579-608443a26e80.png?resizew=364)
A.![]() |
B.1.1Ω |
C.11Ω |
D.![]() |
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2018-07-08更新
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416次组卷
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5卷引用:专题11.2 变压器 电能的输送(精讲)