理想变压器原、副线圈两端所接电路如图所示,图中电表均为理想交流电表,
为电阻箱,定值电阻
,
。原线圈两端接有
的交流电,已知理想变压器原、副线圈的匝数比为
。则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778f0ee02bb6eb3e8ad4f458846e1b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c8dc2b5cdc9c47ac6e875c496c7b886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/986bc10f3bf22ddbc77ac1ee4faa17c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/4c19e9bf-e5a8-48d2-9d7a-caea174e8f2b.png?resizew=264)
A.当电阻箱![]() ![]() ![]() |
B.当电阻箱![]() ![]() ![]() |
C.电阻箱![]() ![]() ![]() |
D.电阻箱![]() ![]() ![]() |
更新时间:2023-12-09 09:14:06
|
【知识点】 变压器两端电路的动态分析
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单选题-单题
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适中
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【推荐1】如图为远距离输电示意图,发电机的输出电压U1和输电线的电阻、理想变压器匝数均不变,且n1:n2=n4:n3.当用户消耗的功率增大时,下列表述正确的是
![](https://img.xkw.com/dksih/QBM/2015/5/5/1575748180893696/1575748211548160/STEM/200c8b6e-1403-44ed-95c8-18a058b48b85.png?resizew=409)
![](https://img.xkw.com/dksih/QBM/2015/5/5/1575748180893696/1575748211548160/STEM/200c8b6e-1403-44ed-95c8-18a058b48b85.png?resizew=409)
A.用户的电压U4增加 |
B.恒有U1:U2=U4:U3 |
C.输电线上损耗的功率减小 |
D.发电机的输出功率不变 |
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单选题-单题
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适中
(0.65)
【推荐2】如图所示,电阻为R、长度为L的导体棒
两个端点分别搭在两个竖直放置、电阻不计、直径也为L且相等的金属圆环上,圆环通过电刷与导线c和d相接。c、d两个端点接在匝数比为
的理想变压器原线圈两端,变压器副线圈接一滑动变阻器
,匀强磁场的磁感应强度大小为B,方向竖直向下。当导体棒绕与
平行的水平轴
以角速度
匀速转动时,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/4/23/2712423090208768/2716813262299136/STEM/49697730-b40d-44ae-98f6-a3ca1074eb56.png?resizew=260)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef788f59b4f155f215c36ea0ac3695f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/270ddac9587bf1ea553914cb69595ab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
![](https://img.xkw.com/dksih/QBM/2021/4/23/2712423090208768/2716813262299136/STEM/49697730-b40d-44ae-98f6-a3ca1074eb56.png?resizew=260)
A.![]() ![]() |
B.当图中的交流电流表的示数为I时,滑动变阻器上的电流为![]() |
C.当滑动变阻器的滑片向f移动时,原线圈两端的输入功率变小 |
D.当滑动变阻器的滑片向f移动时,交流电流表A示数变大 |
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