某玩具汽车的电源与启动电机、车灯连接的简化电路如图所示,当闭合电路开关
,车灯正常发光:若再闭合开关
,汽车启动电机工作,车灯突然变暗。(车灯电阻可视为定值)
(1)请用题中电路图简要解析车灯变暗原因;
(2)若简化电路中电源电动势为
,内阻为
,仅闭合开关
时,车灯正常发光,此时电流表(电流表视为理想电表)读数
;若再闭合开关
启动电机工作后,电流表读数
,求电动机消耗的功率是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d43eb0b274e00cbbc4a210da4165042.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/530f5b63e797195906285c0c03eb9276.png)
(1)请用题中电路图简要解析车灯变暗原因;
(2)若简化电路中电源电动势为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44ed5360a86c4f8725fbc4ad682b3f17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79330bba0239d5560c73d5c0fc718d10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d43eb0b274e00cbbc4a210da4165042.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e7082145d2c2288e38f239a45d23cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/530f5b63e797195906285c0c03eb9276.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab826165fffc07950cb4c13c39c4e6f.png)
![](https://img.xkw.com/dksih/QBM/2020/12/25/2621793550245888/2623025182679040/STEM/72f506b4-88d0-485f-8a3a-352b53e6f78f.png?resizew=215)
更新时间:2020-12-27 08:21:18
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【推荐1】用一直流电动机竖直提升重物,电路如图所示。当输入电压
时,重物静止在水平地面上(电动机不转动),此时电流表的示数为
;当输入电压
时,重物在10s内被匀速提升9m,且此时电流表的示数为
(不计电流表电阻,g取10
)。求:
(1)电动机线圈电阻r;
(2)所提升重物的质量m。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef85b598dec8cb29b41b6418e725192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62dce6dfc8737d492157ce1740d2664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79d94e95b5aaefb2e20853495a2f5ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cafc2bbc68045fe63069cb0661c1a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf15322699ee692781e91e11ee58b91b.png)
(1)电动机线圈电阻r;
(2)所提升重物的质量m。
![](https://img.xkw.com/dksih/QBM/2020/12/3/2606219894972416/2607871684083712/STEM/190e1c01-2ade-4dcf-8789-76bc0f1a2a43.png?resizew=245)
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【推荐2】利用电动机通过如图所示的电路提升重物,已知电源电动势
,电源内阻
,电阻
,重物质量
.闭合电键,当将重物固定时,电压表的示数为5V;当重物不固定且电动机最后以稳定的速度匀速提升重物时,电压表的示数为
求:
不计摩擦,g取![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520b3695e0bd5456c1e1c3a5c980c97e.png)
电动机的内阻.
重物匀速上升时电动机的输入功率.
重物匀速上升的速度大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aae7dda77d583063f5367b2371f4959.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/871014069b8c943b71ada32f340d19bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d38bb17cdbb4a5ddbb482f4519893a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f645f39f937d7f9857ba10e0a489280a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/396cc9df187d5f776f55835625ce9021.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520b3695e0bd5456c1e1c3a5c980c97e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://img.xkw.com/dksih/QBM/2019/1/20/2122815731032064/2145463788019712/STEM/c6a6449a-d236-44eb-ace6-4bc6affca6d7.png?resizew=247)
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【推荐1】如图所示,利用电动机来提升重物的模型,已知电源的电动势
、内阻
,电阻
,重物的质量
。挂上重物电动机不转动时,电压表的示数为
;电动机以稳定的速度匀速提升该重物时,电压表的示数为
。不计一切摩擦,重力加速度g取
,求:
(1)电动机线圈的电阻
;
(2)重物上升时的速度大小;
(3)电动机提升重物时的效率。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c6cf7103ca3f8b26022ccba1a1cb5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/111f7b77e5c3e77b9e00cd99813abe50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90621f329b40e16ac03d824ab3704882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b880d3b31b0f795b52ec3409f96a119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30138f72ee11ff33cdbb63d99889083a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d3f8e168c494b188ab95b83d58da864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63519b11c51441dd31d22aea2e0a4d2d.png)
(1)电动机线圈的电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da64dacbd08c8189b9c48a9220a0021.png)
(2)重物上升时的速度大小;
(3)电动机提升重物时的效率。
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898627849895936/2899229179846656/STEM/3a50d617-66ef-4dfb-b600-8d235033eeb1.png?resizew=248)
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【推荐2】在如图(a)所示的电路中,电源电动势E=3.0V,内阻r=0.5Ω,定值电阻R1的阻值为8Ω,滑动变阻器R2的最大阻值为20Ω,小灯泡L,的U-I图线如图(b)所示。闭合电键S,将变阻器的滑动片由a移到b端的过程中,
(1)滑片在何处时,灯泡的电阻最大?为什么?
(2)滑片在何处时,灯泡最暗?此时灯泡的功率为多少?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/091b5cb9-9db2-4a8a-a8c8-aab189aeb816.png?resizew=184)
(1)滑片在何处时,灯泡的电阻最大?为什么?
(2)滑片在何处时,灯泡最暗?此时灯泡的功率为多少?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/091b5cb9-9db2-4a8a-a8c8-aab189aeb816.png?resizew=184)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/86219708-7d22-45ee-a9f2-64dc50207dfd.png?resizew=221)
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