如题图所示,理想变压器原、副线圈匝数之比
,
和
为完全相同的定值电阻,电压表为理想电表,原线圈两端加电压
(V),则电压表的示数为( )
![](https://img.xkw.com/dksih/QBM/2022/3/9/2939750244548608/2941762396495872/STEM/3e8ea8fc-8348-44e5-bfea-795c4faaab43.png?resizew=181)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dec9d37d9c485cafa8303e44ca68afd.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/8e213e64db3f324b8ae7f5c933224109.png)
![](https://img.xkw.com/dksih/QBM/2022/3/9/2939750244548608/2941762396495872/STEM/3e8ea8fc-8348-44e5-bfea-795c4faaab43.png?resizew=181)
A.220V | B.110V | C.![]() | D.55V |
更新时间:2022-03-22 16:13:49
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【知识点】 理想变压器两端电压与匝数的关系
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【推荐1】对一台理想变压器,原、副线圈的匝数比n1∶n2=20∶1,原线圈接入220 V的交流电压,副线圈向一电阻为110 Ω的用电器供电,则副线圈中的电流为( )
A.2 A | B.0.1 A | C.0.5 A | D.0.005 A |
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【推荐2】如图所示,理想变压器原、副线圈的匝数比为10∶1,b是原线圈的中心接头,电压表V和电流表A均为理想电表,除滑动变阻器电阻R以外其余电阻均不计,从某时刻开始在原线圈c、d两端加上交变电压,其瞬时值表达式为
(V).下列说法中正确的是( )
![](https://img.xkw.com/dksih/QBM/2020/8/11/2525431064141824/2525955894452225/STEM/b8bcd1bf-e268-4c57-b175-cbcd051ff0fc.png?resizew=194)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5359696a2e0dd6081791b43a128c0ea9.png)
![](https://img.xkw.com/dksih/QBM/2020/8/11/2525431064141824/2525955894452225/STEM/b8bcd1bf-e268-4c57-b175-cbcd051ff0fc.png?resizew=194)
A.当单刀双掷开关与a连接时,电压表的示数为22V |
B.![]() |
C.单刀双掷开关与a连接,滑动变阻器触头P向上移动的过程中,电压表和电流表的示数均变小 |
D.当单刀双掷开关由a扳向b时,电压表和电流表的示数均变小 |
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