单选题-单题 适中0.65 引用3 组卷50
如图甲所示,变压器为理想变压器,其原线圈接到U1=220V的交流电源上,副线圈与阻值为R1的电阻接成闭合电路;图乙中阻值为R2的电阻直接接到电压为U1=220V的交流电源上,结果发现R1与R2消耗的电功率恰好相等,则变压器原、副线圈的匝数之比为( )
![](https://img.xkw.com/dksih/QBM/2017/6/2/1700249857138688/1761010764087296/STEM/d8221bce7b60474ea666a732ed8fdb64.png?resizew=410)
![](https://img.xkw.com/dksih/QBM/2017/6/2/1700249857138688/1761010764087296/STEM/d8221bce7b60474ea666a732ed8fdb64.png?resizew=410)
A. | B. | C. | D. |
16-17高二·全国·单元测试
类题推荐
如图所示,图a中变压器为理想变压器,其原线圈接在
(V)的交流电源上,副线圈与阻值R1=2Ω的电阻接成闭合电路,电流表为理想电流表。图b中阻值为R2=32Ω的电阻直接接到
(V)的交流电源上,结果电阻R1与R2消耗的电功率相等,则( )
![](https://img.xkw.com/dksih/QBM/2020/4/16/2442977602486272/2443309715668992/STEM/b6b2f584-bec4-40cc-b5cb-be0b2e1a3798.png?resizew=460)
![](https://img.xkw.com/dksih/QBM/2020/4/16/2442977602486272/2443309715668992/STEM/b6b2f584-bec4-40cc-b5cb-be0b2e1a3798.png?resizew=460)
A.通过电阻R1的交流电的频率为50Hz |
B.电阻R1消耗的电功率为9W |
C.变压器原、副线圈匝数比为8:1 |
D.电流表的示数为2.5A |
如图所示,电路中变压器为理想变压器,其原线圈接在
的交流电源上,副线圈与阻值为R1=2Ω的电阻接成闭合电路,电流表为理想电流表.另有一阻值R2=32Ω的电阻与变压器原线圈并联,电阻R1与R2消耗的电功率恰好相等.则
![](https://img.xkw.com/dksih/QBM/2018/3/16/1903178908467200/1903469649846272/STEM/9a6b7d1b-0393-46be-9f35-8b97ad074173.png?resizew=252)
![](https://img.xkw.com/dksih/QBM/2018/3/16/1903178908467200/1903469649846272/STEM/9a6b7d1b-0393-46be-9f35-8b97ad074173.png?resizew=252)
A.电阻R1消耗的电功率为12.5W |
B.通过电阻R1的交变电流的周期为0.02s |
C.电流表的示数为10A |
D.变压器原、副线圈匝数比为4:1 |
如图所示,理想变压器原线圈接在u=12
sin100πt (V)的交流电源上,副线圈与阻值为R1=2Ω的电阻接成闭合回路,电流表为理想电流表.另有一阻值R2=18Ω的电阻与变压器原线圈并联,电阻R1与R2消耗的电功率恰好相等.则
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/455f60bf-7efb-406a-99fd-dda21835ac1a.png?resizew=213)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/455f60bf-7efb-406a-99fd-dda21835ac1a.png?resizew=213)
A.电流表的示数为2A |
B.电阻R1消耗的电功率为72W |
C.通过电阻的交变电流的频率为50Hz |
D.变压器原副线圈的匝数之比为3∶1 |
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