如图所示,是小型发电机输电的电路模拟图。正弦式交流发电机电动势的有效值稳定,发电机的内阻为R,副线圈接的定值电阻阻值为R、可变电阻为R1,理想变压器的原、副线圈匝数分别为n1∶n2=1∶2,交流电流表、电压表均为理想表,其示数分别用I和U表示。当副线圈接的可变电阻R1的阻值增大△R(其值大于零)时,电流表、电压表示数变化分别用△I和△U表示。则以下说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/1/23/2642494098825216/2642942356119552/STEM/49b335aa-f598-4400-901f-05c829d4f799.png?resizew=339)
![](https://img.xkw.com/dksih/QBM/2021/1/23/2642494098825216/2642942356119552/STEM/49b335aa-f598-4400-901f-05c829d4f799.png?resizew=339)
A.![]() |
B.![]() |
C.当R1=3R时,发电机的输出功率最大 |
D.发电机消耗的总电功率减小 |
更新时间:2021-01-24 11:42:53
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【推荐1】如图所示,理想变压器原线圈接在u=12
sin100πt (V)的交流电源上,副线圈与阻值为R1=2Ω的电阻接成闭合回路,电流表为理想电流表.另有一阻值R2=18Ω的电阻与变压器原线圈并联,电阻R1与R2消耗的电功率恰好相等.则
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/455f60bf-7efb-406a-99fd-dda21835ac1a.png?resizew=213)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/455f60bf-7efb-406a-99fd-dda21835ac1a.png?resizew=213)
A.电流表的示数为2A |
B.电阻R1消耗的电功率为72W |
C.通过电阻的交变电流的频率为50Hz |
D.变压器原副线圈的匝数之比为3∶1 |
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【推荐2】有一种调压变压器的构造如图所示。线圈AB绕在一个圆环形的铁芯上,C、D之间加上输入电压,转动滑动触头P就可以调节输出电压,图中A为交流电流表,V为交流电压表,R1、R2为定值电阻,R3为滑动变阻器,C、D两端按正弦交流电源,变压器可视为理想变压器,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2020/2/16/2400238755168256/2400317439639553/STEM/da8eb348-1b50-4cc2-b5a7-537a3595e553.png?resizew=475)
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A.当R3不变,滑动触头P顺时针转动时,电流表读数变小,电压表读数变小 |
B.当R3不变,滑动触头P逆时针转动时,电流表读数变小,电压表读数变小 |
C.当P不动,滑动变阻器滑动触头向上滑动时,电流表读数变小,电压表读数变大 |
D.当P不动,滑动变阻器滑动触头向上滑动时,电流表读数变大,电压表读数变大 |
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【推荐1】如图甲所示为一理想自耦变压器,
、
端输入电压如图乙所示,
、
和
、
分别是接入原线圈和副线圈中的理想交流电流表和电压表,其示数分别用
、
、
、
表示,
为定值电阻,现将滑片
从图示位置逆时针匀速转动,在
转动过程中,电流表和电压表示数均未超过其量程,下列选项中能正确反映
、
、
、
变化规律的是( )
![](https://img.xkw.com/dksih/QBM/2021/9/16/2809522720366592/2810237554032640/STEM/4b421339-4aba-48ac-b6c1-1f446449c689.png?resizew=559)
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A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】理想变压器的原线圈接正弦式电流,副线圈接负载电阻R,若输入电压不变,要增大变压器的输出功率,可行的措施有( )
A.只增大负载电阻R的阻值 | B.只减小负载电阻R的阻值 |
C.只增大原线圈的匝数 | D.只增大副线圈的匝数 |
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