2022·湖北恩施·模拟预测
名校
1 . 如图甲所示,理想变压器原、副线圈匝数之比
,电阻
,交变电源的电压
随时间变化规律如图乙所示,
、
均为理想电流表。以下判断正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/5/13/2985668608180224/2990414779850752/STEM/c22cfbfe-1ea1-422f-82b6-6827ebb1735d.png?resizew=507)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ede98ace396e767c91f7d2881512edb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b716f4ca7fd58c95d37583f71fe977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad481cbfb67ac9cdbc0537f3de23b022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34a75c2a392f235c5f07b91d9fb58d5.png)
![](https://img.xkw.com/dksih/QBM/2022/5/13/2985668608180224/2990414779850752/STEM/c22cfbfe-1ea1-422f-82b6-6827ebb1735d.png?resizew=507)
A.断开开关S时,原线圈中的电流随时间变化的规律为![]() |
B.闭合开关S,电流表![]() |
C.闭合开关S前后,![]() ![]() |
D.闭合开关S,原线圈输入功率增大 |
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