当前位置:首页>文档>专题55测量电阻的几种方法_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

专题55测量电阻的几种方法_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

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专题55测量电阻的几种方法_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题55测量电阻的几种方法_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题55测量电阻的几种方法_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题55测量电阻的几种方法_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

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专题 55 测量电阻的几种方法 1.[2022·河北保定期末]某同学要测量阻值约为10 Ω的电阻R,实验室有下列器材: x A.电流表A(量程0~0.6 A,内阻R 约0.1 Ω) A B.电压表V(量程0~5 V,内阻R 约5 kΩ) V C.滑动变阻器R(0~10 Ω) D.电池组(电动势E=6 V,内阻r约1 Ω) E.开关和导线若干 实验要求尽可能多测几组数据,该同学根据实验室提供的器材设计了电路,正确连接 仪器后闭合开关,改变滑动变阻器R滑片的位置,记录多组电压表V的示数U和电流表A 的示数I,在坐标纸上作出UI的关系图象,如图乙所示. (1)请将图甲中的实验电路补充完整. (2)依据UI图象可以得出R=________.(结果保留3位有效数字) x (3)电阻R 的测量值________(填“大于”“小于”或“等于”)真实值. x 2.某同学测量电流表G 内阻r 的电路如图甲所示,供选择的仪器如下: 1 1 ①待测电流表G(0~5 mA,内阻约400 Ω) 1 ②电流表G(0~10 mA,内阻约200 Ω) 2 ③定值电阻R(400 Ω) 1 ④定值电阻R(20 Ω) 2 ⑤滑动变阻器R(0~20 000 Ω) 3 ⑥滑动变阻器R(0~20 Ω) 4 ⑦电动势为1.5 V的干电池 ⑧开关及导线若干 (1)定值电阻应选________,滑动变阻器应选________.(在空格内填写序号). (2)请根据原理图,完成实物图连接.(3)实验中测得电流表G 示数为I ,电流表G 示数为I ,以I 为纵轴,I 为横轴,作出 1 1 2 2 1 2 相应图线,如图丙所示.根据II 图线的斜率k及定值电阻,写出待测电流表内阻r 的表达 2 1 1 式________.(用题中所给字母表示). (4)若实验过程中,电路有一处出现故障,使得电流表 G 无示数,电流表G 有示数, 1 2 可能的故障原因是________________. 3.[2022·四川成都阶段练习]某实验小组要精确测定额定电压为220 V的电热丝正常工 作时的电阻,已知电热丝R正常工作时的电阻约为1 100 Ω,实验室提供的器材有: A.定值电阻R=500 Ω 1 B.定值电阻R=1 200 Ω 2 C.滑动变阻器R(阻值范围为0~20 Ω) D.电压表V(量程为0~100 V,内阻为R =1 000 Ω) 1 V1 E.电压表V(量程为0~300 V,内阻R 约为9 kΩ) 2 V2 F.电源E(可视为蓄电池组,电动势为300 V,内阻不计) G.开关S一只 (1)设计了如图所示的电路图,请选择合适的器材:电表1应为________(均填器材前的 字母代号,下同),电表2应为________,实验小组的同学认为应该将电表1________联(填 “串”或“并”)一定值电阻方可顺利完成实验,该定值电阻应为________. (2)实验小组选择器材并按要求正确连接实物电路后,进行了测量. (3)当电热丝R 正常工作时,若电压表V 的测量值为U ,内阻为R ;电压表V 的测 x 1 1 V1 2 量值为U,内阻为R ;定值电阻的阻值分别为R 和R.写出测量电热丝R 正常工作时的电 2 V2 1 2 x 阻的表达式为R=________(用上述给定的部分物理量符号表示). x (4)利用以上电路及实验器材最终测量得到的电热丝R 正常工作时的电阻与准确值相比 x ________(填“偏大”“偏小”或“相等”). 4.实验小组利用变阻箱和一个电流表研究小灯泡工作时的电阻与电流间的关系,设计 电路如图a所示,开关S闭合前,滑动变阻器的滑片滑到a端,变阻器R的阻值调到最大位置. (1)①调节R ,使得测量电路的电压由较低电压开始,先闭合 S ,断开S ,记录电流 P 1 2 I;再断开S,闭合S,调节________,使电流表读数也为I,并记录R的阻值R; 1 1 2 1 1 ②逐次调节________,改变测量电路电压,重复①的测量,得I 、I 、I 、I…,R 、 1 2 3 4 1 R、R、R…. 2 3 4 (2)利用测得的数据,在图b所示坐标纸上画出RI图象; 电流(A) 0.00 0.10 0.20 0.30 0.36 0.39 0.41 0.43 电阻(Ω) 2.50 2.50 3.33 4.17 5.13 6.10 6.98 (3)根据图象判断,当通过的电流为零时,灯丝电阻约为________,当流过的电流为 0.40 A时,灯丝电阻约为________. 5.某同学采用如图甲所示的电路测定未知电阻R,其中R 、R 为定值电阻,R 为电 x 1 2 3 阻箱,G为灵敏电流计,实验步骤如下: (1)实验前,先用多用电表粗测R 的阻值,用“×100”挡时发现指针偏转角过小,他 x 应换用________挡(选填“×10”或“×1 k”); (2)按图甲将图乙中的实物连线补充完整; (3)闭合开关,调整电阻箱的阻值,当电阻箱读数为R 时,灵敏电流计G的示数为零, 0 此时A、B两点电势________(填“相等”或“不相等”),测得R=________(用R 、R 、 x 1 2 R 表示); 0 (4)实验中有同学怀疑R 、R 所标读数不准确,于是他在(3)中读出电阻箱的阻值R 后, 1 2 0 将电路中的电阻箱和R 互换位置,再次调整电阻箱的阻值.当电阻箱的读数为 R′ 时,灵 x 0 敏电流计G的示数再次为零,则R=________(用R、R′ 表示). x 0 0
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  1. CONNECT:[ UseTime:0.000651s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000573s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000266s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000290s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000508s ]
  6. SELECT * FROM `set` [ RunTime:0.000216s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000547s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369355 LIMIT 1 [ RunTime:0.000417s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369355 [ RunTime:0.003365s ]
  10. UPDATE `wendang` SET `lasttime` = 1773087855 WHERE `id` = 369355 [ RunTime:0.000519s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369355 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000513s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369355 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000693s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369355 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001883s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369355 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001116s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369355 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007236s ]
0.088845s