如图所示,理想变压器原、副线圈匝数之比为
,原线圈与定值电阻
串联后,接入输出电压有效值恒定的正弦交流电源。副线圈电路中负载电阻为可变电阻
,
、
是理想交流电表,已知
。当
时,电流表的读数为
,则( )
![](https://img.xkw.com/dksih/QBM/2022/1/4/2894349650812928/2901253717893120/STEM/132ed115-dabe-4b9f-ba55-79bf17f3da86.png?resizew=278)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](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/ff4489d9b83072184c0e1d6b09be50ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478abdd84506a8ef759e353a238db6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b7b485660eea4bead7b27f6e9ab87de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9491196597aeb8472d2144fece98b1ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6699c896d7394a071917fe3922f3864f.png)
![](https://img.xkw.com/dksih/QBM/2022/1/4/2894349650812928/2901253717893120/STEM/132ed115-dabe-4b9f-ba55-79bf17f3da86.png?resizew=278)
A.电源输出电压为![]() |
B.电源输出功率为![]() |
C.当![]() ![]() |
D.当![]() |
更新时间:2022-01-24 10:38:42
|
【知识点】 变压器两端电路的动态分析
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【推荐1】如图所示,一理想自耦变压器线圈AB绕在一个圆环形闭合铁芯上,左端输入正弦交流电压
,
、
为相同的灯泡,其电阻均为
且恒定不变,定值电阻的阻值
为灯泡阻值的一半。当滑片P处于如图所示位置时,AB端与PB端匝数比为
,
、
闭合时,两灯泡均正常发光。下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d1f3dd4da221b98ae6836df1f5c2b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb697bffe0a9fa5d36c92aaf80c4231.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84783b6ba0f36789519816101a437f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910f1655703721b51006b887a2394b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779629f16056a50f4c06e3996d8e1c82.png)
A.灯泡正常发光的电流为1A |
B.灯泡正常发光的电功率为27.5W |
C.![]() ![]() ![]() |
D.断开![]() ![]() |
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【推荐2】如图,理想变压器原线圈与阻值为12 Ω的定值电阻R0以及电流表串联后接在
的交流电源上,理想变压器原、副线圈总匝数相同,滑动触头P0初始位置在副线圈正中间,原、副线圈匝数比为n。定值电阻R1=6 Ω。电流表、电压表均为理想交流电表。下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2023/5/3/3229609498509312/3230297286688768/STEM/a8ebe869f96841dba995e1e6234c2536.png?resizew=182)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0976e70b2c281d0a31508f13a49ff7a9.png)
![](https://img.xkw.com/dksih/QBM/2023/5/3/3229609498509312/3230297286688768/STEM/a8ebe869f96841dba995e1e6234c2536.png?resizew=182)
A.通过电阻R1的电流方向每秒钟改变100次 |
B.电流表示数为1 A |
C.电压表示数为6 V |
D.若滑动触头向上滑动,则电流表、电压表示数均增大 |
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