如图所示,M、N两端接正弦式交变电流,理想变压器原、副线圈的匝数之比为
,R1、R2均为定值电阻,R1=1Ω,R2=9Ω,原线圈的等效电阻为R原,各电表均为理想交流电表,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6a005871aca17d7ba2047b0f8fab0b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/23/21d83871-2df1-4024-a07c-b117deea4637.png?resizew=205)
A.原线圈的等效电阻R原与定值电阻R1的阻值之比为3:1 |
B.定值电阻R1与原线圈两端的电压之比为1:1 |
C.定值电阻R1与R2两端的电压之比为3:1 |
D.若M、N两端输入电压变为原来的一半,则两电表的示数均变为原来的一半 |
2023·湖南·模拟预测 查看更多[1]
(已下线)2023年湖南省新高考普通高中学业水平选择性考试模拟试题(一)
更新时间:2023-05-21 23:07:46
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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】如图所示的理想变压器电路中,变压器原、副线圈匝数比为
,在a、b端输入正弦式交流电压有效值为U,甲、乙、丙三个灯泡均能正常发光,且三个灯泡的额定功率相等,则下列说法正确的是( )
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【推荐2】某同学利用如图电路模拟远距离输电,图中交流电源电压有效值为
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.小灯泡电阻不变,导线电阻忽略不计,双刀双掷开关S分别接通电路I和电路Ⅱ,两电路都稳定工作时,( )
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A.灯泡![]() ![]() | B.通过电阻![]() ![]() |
C.灯泡![]() ![]() | D.电阻![]() ![]() |
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