理想变压器原线圈接有理想交流电流表,副线圈接有两个电热器
与
,其铭牌参数分别为“220V 1100W”和“220V 440W”,如图甲所示。若原线圈接入如图乙所示的正弦交变电压时,两电热器均正常工作,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/4/13/2699147061968896/2700574594498560/STEM/e8ca5802-cf96-4e78-9919-89c3421e3dea.png?resizew=415)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://img.xkw.com/dksih/QBM/2021/4/13/2699147061968896/2700574594498560/STEM/e8ca5802-cf96-4e78-9919-89c3421e3dea.png?resizew=415)
A.变压器原线圈的输入电功率为1540W | B.变压器原、副线圈的匝数比为10∶1 |
C.原线圈输入电压为3110V | D.理想交流电流表的示数为7A |
更新时间:2021-04-15 21:55:59
|
【知识点】 结合图象计算变压器两端的电表示数
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【推荐1】如图甲所示电路中,
为标有“4V,2W”字样的小灯泡,
、
为两只标有“8V,6W”字样的相同灯泡,变压器为理想变压器,各电表为理想电表,当ab端接如图乙所示的交变电压时,三只灯泡均正常发光。下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/5/9/2982631842578432/2982974443986944/STEM/b4682f44-30f7-4f14-945a-9333384f33a7.png?resizew=540)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e76322da99c521981992a53339042c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7afbfe404ad5febf1904d763974967b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cddc914628565e13f2980fdfa8caa739.png)
![](https://img.xkw.com/dksih/QBM/2022/5/9/2982631842578432/2982974443986944/STEM/b4682f44-30f7-4f14-945a-9333384f33a7.png?resizew=540)
A.电流表的示数为1.5A | B.交变电压的最大值![]() |
C.变压器原、副线圈的匝数之比为3∶1 | D.电压表的示数为24V |
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【推荐2】如图甲所示为两组铜线制成的线圈绕在同一个铁芯上,线圈电阻不计,流过电阻R的电流随时间变化的关系如图乙所示,规定
为电流正方向,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/946791af-626f-48fe-a93f-2d21f4666bbc.png?resizew=439)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258339dc2773b66c8327b0ace18fb994.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/946791af-626f-48fe-a93f-2d21f4666bbc.png?resizew=439)
A.原线圈![]() |
B.电阻R两端电压的有效值为![]() |
C.在![]() ![]() |
D.在![]() ![]() |
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