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恒定电流专题60_2025高中教辅(后续还会更新新习题试卷)_2025高中全科《微专题·小练习》_2025高中全科《微专题小练习》_2025版·微专题小练习·物理

  • 2026-03-06 04:56:23 2026-02-03 08:31:57

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恒定电流专题60_2025高中教辅(后续还会更新新习题试卷)_2025高中全科《微专题·小练习》_2025高中全科《微专题小练习》_2025版·微专题小练习·物理
恒定电流专题60_2025高中教辅(后续还会更新新习题试卷)_2025高中全科《微专题·小练习》_2025高中全科《微专题小练习》_2025版·微专题小练习·物理
恒定电流专题60_2025高中教辅(后续还会更新新习题试卷)_2025高中全科《微专题·小练习》_2025高中全科《微专题小练习》_2025版·微专题小练习·物理

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专题 60 实验:测量电池的电动势和内阻 授课提示:对应学生用书95页 1.[2024·贵州省黔东南期中检测]某同学用伏安法测量标称值为1.5 V的干电池的电动 势和内电阻,所用电压表量程为3 V、内阻约为3 kΩ,电流表量程为0.6 A、内阻约为0.5 Ω.实验中有图(a)和(b)两个电路图供选择,该同学选用合适的电路图得到的电压 U和电流I 的关系图线如图(c)所示. (1)该同学选择的电路图是图________(填“a”或“b”); (2)由图(c)可知,干电池的电动势E为________V,内电阻r为________Ω(结果保留到 小数点后两位); (3)若选择另一个电路图进行实验,在图(c)上用实线画出实验中应得到的图线的示意图. 答案:(1)a (2)1.48(1.47或1.49也可) 0.96(0.94~0.98均可) (3)图见解析 解析:(1)因电源内阻与电流表内阻很接近,故应采用相对电源来说的电流表外接法, 应选图(a)所示电路图. (2)由E=U+Ir,可知U=E-Ir.则UI图像的纵截距表示电源电动势,斜率的绝对值表 示内阻,即E=1.48 V,r= Ω=0.96 Ω (3)若选择b电路图进行实验,则E=U+I(R +r),可得I== A≈0.33 A,在图(c)上用 A 实线画出实验中应得到的图线的示意图,如图 2.如图甲所示,用铜片、铝片和可乐可以做成可乐电池,电动势大约在 0.5 V~0.6 V 之间,内阻几千欧左右,某实验兴趣小组制作了一个可乐电池并测量其电动势和内阻.(1)如图乙所示,直接用多用电表“直流2.5 V”量程测量出可乐电池的电动势大小为 ________ V(保留两位有效数字); (2)现有实验器材: A.电压表(0~3 V,R 约为3 000 Ω) V B.电流表(0~300 μA,R 为300 Ω) A C.电阻箱(0~9 999 Ω) D.滑动变阻器(0~20 Ω) E.开关,导线若干 ①为了更准确测量可乐电池的电动势和内阻,选择合适的器材并按电路图__________ 完成电路连接; ②通过数据处理画出相应的可乐电池R图像如图丙实线所示,可知该可乐电池的内阻 约为____________ Ω; ③将该可乐电池静置5 h后再次测量获得的R图像如图丙虚线所示,可知该可乐电池 的电动势____________.(选填“增大”“减小”或“不变”) 答案:(1)0.42(0.43也可) (2)①A ②1 900 (1 800也可) ③不变 解析:(1)用中间一圈的刻线读数,其中250即是2.50 V,50即是0.50 V,则电池的电 动势大小为0.42 V.(2)提供的电压表量程太大,可用安阻法测量,即用电路A.由闭合电路 欧姆定律得E=I(R+r +r),整理得R=-(r +r),结合图像可知r +r=2 200 Ω,解得电 A A A 池的内阻r=2 200 Ω-300 Ω=1 900 Ω,图线的斜率表示电动势,静置5 h后的图线与原 图线平行,斜率不变,则电动势不变. 3.某实验小组的同学为测量由两节干电池组成的电池组的电动势 E和内电阻r,设计 了如图甲所示的实验电路,其中R为电阻箱,定值电阻R =3 Ω.实验过程中获得了多组电 0 压表示数U和相应的电阻箱阻值R,并绘制出了与图像如图乙所示,则:(1)根据图像求得电池组的电动势测量值E=________ V,内电阻测量值r=________ Ω;(结果均保留两位有效数字). (2)由实验原理可知,该实验得到的电动势的测量值________(选填“大于”“小于”或 “等于”)真实值,内电阻的测量值________(选填“大于”“小于”或“等于”)真实值. 答案:(1)3.0 2.0 (2)小于 小于 解析:(1)根据闭合电路欧姆定律E=U+(R +r)可得=·-,由关系图线知纵截距绝对 0 值=0.2 Ω,又R =3.0 Ω,得r=2.0 Ω;由图线的斜率k==,解得E=3.0 V; 0 (2)根据实验原理可知,电动势的测量值E =·R<E ,故测量值应小于电源电动势真 测 V 真 实值,内电阻的测量值r =-R =<<r ,故内电阻的测量值小于真实值. 测 0 真
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  1. CONNECT:[ UseTime:0.001200s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001707s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000766s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000694s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001353s ]
  6. SELECT * FROM `set` [ RunTime:0.000525s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001521s ]
  8. SELECT * FROM `wendang` WHERE `id` = 120253 LIMIT 1 [ RunTime:0.001043s ]
  9. UPDATE `wendang` SET `liulancishu` = 9 WHERE `id` = 120253 [ RunTime:0.025690s ]
  10. UPDATE `wendang` SET `lasttime` = 1773100711 WHERE `id` = 120253 [ RunTime:0.001197s ]
  11. SELECT * FROM `wendang` WHERE `id` < 120253 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001174s ]
  12. SELECT * FROM `wendang` WHERE `id` > 120253 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000524s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 120253 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001055s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 120253 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003341s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 120253 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003018s ]
0.212085s