在如图所示电路中,电源电动势为
,电源内阻为
,电路中电阻
为
,小型直流电动机
的内阻为
,闭合开关
后,电动机转动,理想电流表的示数为
。则以下判断中正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/12/16/2873808632553472/2873958834814976/STEM/049db3ac-41c0-4695-a309-ea0504976846.png?resizew=204)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3216e8cd0c9be9c505f00230563d2298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fd5d16bd2c1c2aa3e6ebbd2c534e3eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee5b7e91d647021b85a223fb0483b05a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8f1796428c2600bbbdff746b0311583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66de503c8055c43644b847eba74b50f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3482b3e788f6069d41ee5a190c7ef1f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e7fa07e4fbe9f7f5ef712e1246d970.png)
![](https://img.xkw.com/dksih/QBM/2021/12/16/2873808632553472/2873958834814976/STEM/049db3ac-41c0-4695-a309-ea0504976846.png?resizew=204)
A.电源两端的电压为 ![]() | B.电源输出的电功率为 ![]() |
C.电动机两端的电压为 ![]() | D.电动机的输出功率为 ![]() |
更新时间:2021-12-16 21:07:07
|
【知识点】 含有电动机电路综合计算
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【推荐1】如图为某地铁系统供电的变电站示意图,理想变压器原线圈两端连接有效值为
的交流电源,两副线圈分别连接牵引电机和照明系统。已知两副线圈匝数分别为
和
,牵引电机的额定电压为
,额定功率为
,照明系统的额定电压为
,闭合开关S,牵引电机和照明系统均能正常工作。则( )
![](https://img.xkw.com/dksih/QBM/2022/5/10/2976393878355968/2976647086538752/STEM/ac8bb283-4c37-4d9b-a544-48d8a73e9042.png?resizew=252)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70f2244d643d2393618288de6c13e6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89da02795f659c72dbcbbe351af6de18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2587935a498e4af3ed5a02e0ab075dbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d221fcab8f7044810b15767d4402042.png)
![](https://img.xkw.com/dksih/QBM/2022/5/10/2976393878355968/2976647086538752/STEM/ac8bb283-4c37-4d9b-a544-48d8a73e9042.png?resizew=252)
A.![]() | B.牵引电机的内阻为![]() |
C.S断开后,原线圈电流为![]() | D.S断开前后,原线圈电流不变 |
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适中
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【推荐2】近年来,机器人逐渐走人我们的生活。如图所示,一款微型机器人的直流电动机的额定电压为U,额定电流为I,线圈电阻为R,将它接在电动势为E,内阻为r的直流电源的两极间,电动机恰好能正常工作,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/2/21/2928219327840256/2928379006607360/STEM/e550626d-c3df-4a93-97b2-477c78fd5ddc.png?resizew=97)
![](https://img.xkw.com/dksih/QBM/2022/2/21/2928219327840256/2928379006607360/STEM/e550626d-c3df-4a93-97b2-477c78fd5ddc.png?resizew=97)
A.电动机消耗的热功率为UI |
B.电源的输出功率为UI |
C.电源的效率为1-![]() |
D.电动机消耗的总功率为EI |
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