一个含有理想变压器的电路如图所示,图中电阻
、
的阻值分别为
,
,接入正弦式交流电源,输出电压的有效值恒定。当开关断开时,理想电流表的示数为I;当闭合开关时,理想电流表的示数为2I,该变压器原、副线圈匝数比为1:2,则
的阻值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/97c03563-5699-40d0-8254-f64cafddfdee.png?resizew=215)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2c4640b2bee411935f588fc5433c74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/612380b990d6bf759e8a98d1b8246c1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26cd54015976f871ad7dfc0f220a3d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/97c03563-5699-40d0-8254-f64cafddfdee.png?resizew=215)
A.1Ω | B.![]() | C.![]() | D.![]() |
更新时间:2023-04-06 16:01:10
|
【知识点】 变压器两端电路的动态分析
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【推荐1】如图为理想变压器,其原、副线圈的匝数比为10:1,原线圈接有交流电压
;图中电压表和电流表均为理想交流电表,RT为负温度系数的热敏电阻(即当温度升高时,阻值减小),R0、R1为定值电阻,C为电容器.通电一段时间后,下列说法正确的是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/2aa21211-b850-4b2c-aab9-f069f47813c2.png?resizew=310)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b93dc3cfdc5983dbe2de10a44eefa7d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/2aa21211-b850-4b2c-aab9-f069f47813c2.png?resizew=310)
A.A1表的示数和A2表的示数都减小 | B.V1表的示数和V2表的示数都增大 |
C.通过R1的电流始终为零 | D.变压器的输入功率增大 |
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【推荐2】如图所示,理想变压器的原、副线圈匝数比为
,原线圈通过灯泡
与正弦式交流电源相连,电源电压恒定,副线圈通过导线与灯泡
和
相连,三个灯泡规格完全相同。三个灯泡都能发光(不考虑灯丝电阻随温度变化的情况),工作中
灯丝被烧断,关于
灯丝烧断后说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/d0894380-7b43-4151-8d51-908ba585400f.png?resizew=217)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe103f073845122c66f22dcb14b711f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb697bffe0a9fa5d36c92aaf80c4231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f28c99010b1e844cc2a9f7abc2301cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9c3ff056a980ac1f943fa3d11752ab7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9c3ff056a980ac1f943fa3d11752ab7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9c3ff056a980ac1f943fa3d11752ab7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/d0894380-7b43-4151-8d51-908ba585400f.png?resizew=217)
A.灯泡![]() | B.灯泡![]() |
C.原线圈两端的电压变小 | D.变压器输入功率不变 |
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