图中
、
是规格为“
”的灯泡,
端所接的交变电压
,现调节电阻箱
为某一值时,恰好能使两个灯泡均正常发光。已知变压器为理想变压器,电表均为理想电表。则 ( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/92a54fbc-2244-4c0d-b856-9cc2d440caa6.png?resizew=273)
![](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/8eab9e997c0f84aef7ca87c4cf9bd39c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663a61ad241d5d874c9a9362f0ee917c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0dd8fedfaa3110f19185a703b747393.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/92a54fbc-2244-4c0d-b856-9cc2d440caa6.png?resizew=273)
A.电流表![]() |
B.电流表![]() |
C.增大电阻箱![]() ![]() |
D.增大电阻箱![]() ![]() |
更新时间:2023-02-19 22:57:23
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【推荐1】某小型发电站通过升压变压器向60 km远处的用户供电,在用户端用降压变压器将高压电变为220 V供用户使用(设两个变压器均为理想变压器),输电示意图如图所示.已知输电线的电阻率为ρ=1.25×10-8 Ω·m,横截面积为1.5×10-4 m2,发电机输出功率为20 kW,输出电压为250V,若线路损耗的功率为输出功率的5%.则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2016/3/21/1575842165383168/1575842165555200/STEM/c3d689c6-c1ff-4d6e-8964-8e25930d498c.png?resizew=285)
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A.发电机是将其他形式能转化为电能的设备,发电原理是法拉第电磁感应定律 |
B.输电线上的电流为10 A |
C.![]() ![]() |
D.升压变压器的输出电压等于降压变压器的输入电压 |
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【推荐2】图甲所示的电路由理想变压器、理想电流表、理想电压表及负载电阻R组成,负载电阻的阻值为
,变压器原、副线圈的匝数比
,且原线圈接入如图乙所示的正弦交变电压,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/5/25/2728667608219648/2729975366770688/STEM/54a7cc48-390f-476f-89db-f568fc58ee18.png?resizew=540)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b56a56c843d3c6b0a9d1a6071f8f4948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1deff0dbab89aff36d83d7aa0c5e2414.png)
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A.通过电阻R的交流电频率为![]() |
B.电压表的示数为22V |
C.电流表的示数为1A |
D.电阻R的功率为22W |
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【推荐1】理想变压器连接灯泡和滑动变阻器的电路如图所示,M、N端连接一个稳压交流电源,三个相同灯泡
、
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![](https://img.xkw.com/dksih/QBM/2022/1/12/2892771120078848/2894232404746240/STEM/208762d0-28f2-4411-a53f-8877b3fba1c2.png?resizew=239)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87f93f4e10d9672fa6bd67243bc23d4a.png)
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A.灯泡![]() ![]() | B.灯泡![]() ![]() |
C.电源输出功率一定增大 | D.滑动变阻器电功率一定增大 |
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【推荐2】如图所示,电路中有阻值均为R的五个完全相同的纯电阻元件,a、b两端接交流电源,所有电表均为理想电表,理想变压器原、副线圈的匝数分别为
、
。开关S闭合前、后,电压表V1的示数分别为
、
,电压表V2的示数分别为
、
。已知
,开关S闭合前、后,电压表V3的示数
始终不变,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/4/16/2701063429021696/2701319691149312/STEM/7a9bb188-2333-4fc3-8064-5b6f888b0415.png?resizew=355)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d655a1699028206c357aca62e31525f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbe5cb81b72e94f92d2aaecd553daac2.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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