2022年中考物理微测试系列专题20滑动变阻器的作用 .pdf

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1、专题 20 滑动变阻器的作用学校：_姓名：_班级：_ 1.【天津市2015 年初中学生学业考试考试】如图是滑动变阻器的结构和连入电路的示意图，当滑片 P向右滑动时，连入电路的电阻变小的是（）【答案】D【解析】滑动电阻器的原理是通过改变接入电路中的电阻丝的长度改变接入电路的电阻，连入电路中要接一上一下两个接线柱，下面接哪个接线柱滑片往哪边滑电阻丝长度变短，连入电路的电阻变小。故正确答案选 D。【考点定位】滑动变阻器的用法2.【黑龙江省龙东地区2015 年初中毕业学业统一考试】如图所示，当滑动变阻器滑片P向右移动时，下列判断正确的是（）A.电压表的示数不变，电流表A1的示数变大，A2的示数变小B.

2、电压表的示数不变,电流表A1的示数不变，A2 的示数变大C.电压表的示数与A1的示数的比值变大，A2的示数变小D.电压表的示数与A1的示数的比值不变，A2 的示数变小【答案】D【考点定位】滑动变阻器3.【内蒙古赤峰市2015 年中考理综物理试题】如图所示，是一种测定油箱内油量的装置，其中R是滑动变阻器的电阻片，滑动变阻器的滑片和滑杆相连，滑杆可绕固定轴O转动，另一端固定着一个浮子。下列说法正确的是（）A、油量变少，电流表示数不变B、油量越少，电流表示数越大C、油量越多，电流表示数越小D、油量越多，电流表示数越大【答案】D【解析】当油量变少时，浮子下沉，此时滑杆绕O点转动，变阻器电阻增大，总电阻

3、变大，所以电流会变小，电流表示数减小，故A、B都错；当油量增多时，浮子上浮，此时滑杆绕O点转动，变阻器电阻尊小，总电阻变小，所以电流会变大，电流表示数增大，故C错误、D正确；应选D。【考点定位】滑动变阻器4.【山东省烟台市2015 年中考物理试题】在图所示的电路中，电源两端的电压保持不变，开关闭合后，滑动变阻器的滑片P向左移动时，三个电表的示数变化情况是（）AA的示数变小，V1的示数不变，V2的示数变小BA的示数变大，V1的示数变大，V2的示数变小CA的示数变小，V1的示数不变，V2的示数变大DA的示数变大，V1的示数变小，V2的示数变大【答案】C【解析】由图示可知，变阻器与灯泡是串联的，当开

4、关闭合后，滑动变阻器的滑片P向左移动时，变阻器电阻增大，总电阻增大，总电流减小，电流表示数变小，故B、D错；电压表V1测总电压，所以示数不变，电压表 V2测变阻器两端的电压，电流减小时，灯泡的电压减小，所以电压表V2的示数是增大的，故A错误，C正确；应选C。文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编

5、码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R

6、9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q

7、9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K

8、10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2

9、S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1

10、Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y1

11、0E5文档编码:CN7R9Z3G5Q9 HD4K10V4P2S5 ZE1Q5U5Y10E5【考点定位】滑动变阻器5.【福建省泉州市2015 年中考物理试题】如图所示的电路中，电源电压不变，R为滑动变阻器。闭合开关S后，在滑片P向右移动过程中（）A.电流表A1的示数 变小，灯泡变暗B.电流表A的示数变小，电压表V的示数变大C.电压表V的示数不变，电路的总电流变大D.电压表V的示数不变，灯泡的亮度不变【答案】D【考点定位】滑动变阻器6.【青海省2015 年初中学生学业考试】小华想用滑动变阻器控制小灯泡的亮度，设计了如图所示的4 种电路，其中正确的是（）A.B.C.D.【答案】A【考点定位】滑动变阻

12、器的用法文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F

13、7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D1

14、0I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7

15、A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS

16、1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9

17、D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2

18、A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O87【甘肃省武威市第四中学2015 届中考模拟】在探究“电阻上的电流跟两端电压关系”的实验过程中（1）小刚同学做出了以下猜想：A 电阻一定，电流跟电压成正比B电阻一定，电流跟电压成反比C电流跟电压无关你认为合理的猜想是_（填序号），你的依据是_（2）为了检验

19、猜想是否正确，小刚设计了如图所示的电路图，其中电源电压为3 V，电阻R为 20，变阻器R 上标有“151A”字样请你帮他选量程：电压表应选 V，电流表应选 A上表是小刚记录的数据，请你替小刚写出结论：电阻一定时，小刚在实验中想把电压表的示数调到1V，但无论怎样调节都无法达到要求，其原因是（3）小刚还想用这个电路研究电流跟电阻的关系，并与上表中的第1 次实验数据作比较，于是他把20的电阻换成10，闭合开关后，小刚的下一步操作是，记录数据；接着他再把10电阻换成 5，重复上述操作【答案】（1）A 电阻一定时，导体两端的电压越大，通过导体的电流越大（2）0 3 00.6 通过导体的电流与导体两端的电

20、压成正比滑动变阻器的最大阻值太小（3）调节滑动变阻器使电压表的示数保持2V 实验次数1 2 3 电压U/V 2 2.4 2.8 电流I/A 0.1 0.12 0.14 文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X

21、1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I

22、5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4

23、U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F

24、7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D1

25、0I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7

26、A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O88.【丹东七中2014-2015 学年度下学期九年级第一次模拟】如图12 所示，用笔画线代替导线

27、，将图中元件连接成电路，要求：电压表测量灯泡两端的电压，当滑动变阻器的滑片向左移动时，灯泡变亮。【答案】如下图所示图 12 文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2

28、A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:

29、CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 H

30、J9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 Z

31、R2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编

32、码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1

33、 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O89【广西省梧州市2015 年初中毕业升学考试抽样调研测试】某实验小组探究金属丝电阻大小与长度的关系，他们取一段粗细均匀的金属丝拉直连接在A、

34、B接线柱上，在金属丝上安装一个可滑动的金属夹P实验室还提供了下列器材：电压表、电流表、电池组（电压3 V）、滑动变阻器（20 2 A）、刻度尺、开关和导线若干（1）为了测量AP段的电阻R，他们连接了如图15 甲所示的电路，连接电路时，开关应_（2）某次实验中测得电压表的读数为2.1V，电流表指针偏转如图15 乙所示，则电流表的读数为I=_A，此时金属丝的电阻R=_（3）实验中移动金属夹P，分别测出AP段的长度l和对应的电压电流值，并计算出电阻值R，其中l和R的数据如下表：l/cm 30 40 50 60 70 80 R/2.1 2.8 3.5 4.2 4.9 5.6 分析表中数据，可知_（4）

35、小军同学认为，由于电源电压没有超过电压表所选量程的最大值，因此在闭合开关前，可以将变阻器的滑片置于任意位置你认为他的想法是_（填“正确”或“错误”）的，理由是：_【答案】（1）断开（2）0.42 5 （3）R与l成正比关系（4）错误电流表的测量值可能超过所选量程的最大值10.【甘肃省武威、平凉、张掖、定西市2015 年初中毕业和高中阶段招生考试】如图所示的电路中，有几根导线尚未连接，请用笔画线代替导线补上。补上后要求：两灯泡并联；电流表测灯L1的电流；闭合开关后，向A端移动滑动变阻器的滑片P，两灯均变暗。文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码

36、:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1

37、HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1

38、ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档

39、编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H

40、1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P

41、1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8

42、文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8【答案】如下图所示【解析】电流表与灯泡L1应串联，根据向A端移动滑动变阻器的滑片P，两灯均变暗，可知应把滑动变阻器的B接线柱接在电路中；如上图所示。【考点定位】电路的连接；滑动变阻器11.【甘肃省武威、平凉、张掖、定西市2015 年初中毕业和高中阶段招生考试】（10 分）学习了电流、电压和电阻知识后，同学们发现电流与水管中的水流相似、电压与水压差相似。

43、李明和同学们提出：导体对电流的阻碍作用可能与水管对水流的阻碍作用相似，所以影响导体电阻大小的因素，他们提出了以下猜想：猜想一：（类比管道长短）导体电阻大小可能与导体的长度有关；猜想二：（类比管道粗细）导体电阻的大小可能与导体的横截面积有关。于是他们从实验室老师那儿借来了某合金材料制成的各种长度和横截面积的电阻丝，并设计了如图所示的电路。连接电路时，开关S应处于状态（选填“断开”或“闭合”），闭合开关前滑动变阻器的滑片P应置于（选填“a”或“b”）位置；闭合开关后，他们发现电流表无示数，但电压表示数接近电源电压，你判断他们的电路出现的故障可能是。电路连接正确后，他们经过认真测量，得到了下表所示的

44、数据：文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7

45、X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10

46、I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A

47、4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1

48、F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D

49、10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A

50、7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8文档编码:CS1F7X1Y1H1 HJ9D10I5H5P1 ZR2A7A4U8O8物理量序号1 2 3 4 5 6 7 8 9.长度 L/m 2.0 4.0 6.0 2.0 4.0 6.0 2.0 4.0 6.0.横截面 S/mm21.0 1.0 1.0 2.0 2.0 2.0 4.0 4.0 4.0.电阻 R/2.0 4.0 6.0 1