1 . 某发电机能够产生正弦式交变电流。利用该发电机(内阻可忽略)通过理想变压器向定值电阻
供电,电路如图所示,理想交流电流表A、理想交流电压表V的读数分别为
、
,
消耗的功率为
。若发电机线圈的转速变为原来的2倍,则( )
![](https://img.xkw.com/dksih/QBM/2020/7/31/2517993509912576/2518569494708224/STEM/3fc29a5d-64c5-4220-9f42-d98d89e97351.png?resizew=212)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52b4f24969673c863b5aff4fb6751ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2020/7/31/2517993509912576/2518569494708224/STEM/3fc29a5d-64c5-4220-9f42-d98d89e97351.png?resizew=212)
A.![]() ![]() | B.电压表V的读数变为![]() |
C.电流表A的读数变为![]() | D.通过![]() |
您最近一年使用:0次
2020-08-01更新
|
453次组卷
|
4卷引用:湖北省2021届高考物理临考练习六
(已下线)湖北省2021届高考物理临考练习六(已下线)2021年高考物理各地市模拟题专题汇编-专题14 交变电流2021届广东省惠州市高三下学期第一次调研考试物理试题2021届云南省红河州高三上学期第一次复习统一检测理综合物理试题
名校
2 . 如图甲所示为一理想变压器,原、副线圈的匝数比为n1 : n2=2∶1,且分别接有电阻R1和R2,R1=R2=400Ω.U为电压有效值不变的正弦交流电源,闭合开关K时,通过电阻R2的电流如图乙所示,则此时
![](https://img.xkw.com/dksih/QBM/2019/3/5/2154002724872192/2156175210438656/STEM/04095da4-942c-4ebe-8afd-b9a95d8bcf82.png?resizew=470)
![](https://img.xkw.com/dksih/QBM/2019/3/5/2154002724872192/2156175210438656/STEM/04095da4-942c-4ebe-8afd-b9a95d8bcf82.png?resizew=470)
A.用电压表测量交流电源电压约为424 V |
B.交流电源的输出功率90 W |
C.断开开关K后,通过电阻R1的电流变成原来的一半 |
D.R1和R2消耗的功率之比为1∶2 |
您最近一年使用:0次
3 . 理想变压器如图甲所示,原线圈与图乙所示的交流电源相连,已知
当滑动变阻器
调至
时,R1消耗的功率为0.2 W,且“3V,0.6W”的灯泡正常发光,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2017/5/31/1698834268381184/1703139572498432/STEM/05fd7d5a-4d02-4383-9028-fad0aa9bffba.png?resizew=377)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c8dc2b5cdc9c47ac6e875c496c7b886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a6041c88c8701ce1068b611f27aa4a.png)
![](https://img.xkw.com/dksih/QBM/2017/5/31/1698834268381184/1703139572498432/STEM/05fd7d5a-4d02-4383-9028-fad0aa9bffba.png?resizew=377)
A.原、副线圈的匝数之比为2:l |
B.副线圈电流的频率为25Hz |
C.交流电源的输出功率为![]() |
D.若滑动变阻器R2的滑片向左滑动,灯泡将变暗 |
您最近一年使用:0次