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恒定电流专题61_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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恒定电流专题61_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61_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61_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 61 实验:多用电表的使用 授课提示:对应学生用书96页 1.在“练习使用多用电表”的实验中,某同学进行了如下操作和思考. (1)利用多用电表测量未知电阻,用欧姆挡“×100”测量时发现指针示数如图所示, 为了得到比较准确的测量结果,下列选项中合理的步骤为________(选填字母代号并按操作 顺序排列); A.将选择开关旋转到欧姆挡“×1 k”的位置 B.将选择开关旋转到欧姆挡“×10”的位置 C.将两表笔分别与被测电阻的两根引线相接完成测量 D.将两表笔短接,调节欧姆调零旋钮使指针指向“0 Ω” (2)该同学想进行如图所示的操作,下列说法正确的是________(选填字母代号); A.图甲中将选择开关旋转到直流电压挡,选择合适量程可测量小灯泡两端电压 B.图乙中将选择开关旋转到直流电流挡,选择合适量程可测量流经小灯泡的电流 C.图丙中将选择开关旋转到欧姆挡,选择合适量程可测量闭合电路中小灯泡的电阻 D.图丁中将选择开关旋转到欧姆挡,选择合适量程可观察到此时欧姆表示数很小 答案:(1)BDC (2)AB 解析:(1)欧姆挡测电阻时指针偏转角度过大,是由于挡位过大,需选取小挡位,进行 欧姆调零后再测阻值,故顺序为BDC.(2)图甲中将选择开关旋转到直流电压挡,选择合适 量程可测量小灯泡两端电压,故A正确;图乙中将选择开关旋转到直流电流挡,选择合适 量程可测量流经小灯泡的电流,故B正确;测量小灯泡电阻时,小灯泡不能外接其他电源, 故C错误;由图结合欧姆表的内部电路可知,二极管两端为负向电压,此时二极管电阻无 穷大,可观察到此时欧姆表示数很大,故D错误. 2.小明同学打算将一只量程为250 μA的灵敏电流计(内阻未知,约为几百欧)改装成 多用电表,他设计的改装电路如图甲所示.图甲中Ⓖ为灵敏电流计,R 、R 、R 、R 和R 1 2 3 4 5 是定值电阻,R 是滑动变阻器,实验室中还有两个备用滑动变阻器,变阻器 R (0~1 000 6 7Ω),变阻器R (0~10 000 Ω). 8 (1)用图乙所示电路采用半偏法测定灵敏电流计G的内阻.先将变阻器R的阻值调至最 大,闭合S ,缓慢减小R的阻值,直到G的指针满偏;然后闭合S ,保持R的阻值不变, 1 2 逐渐调节R′的阻值,使G的指针半偏,此时电阻箱R′的读数为480 Ω,则灵敏电流计G的 内阻为____________;若图乙电路中干电池的电动势为 E=1.5 V,则变阻器 R 选 __________(填“R ”或“R ”). 7 8 (2)图甲中的A端与________(填“红”或“黑”)色表笔相连接. (3)若图甲中多用电表的5个挡位为:直流电压1 V挡和5 V挡,直流电流1 mA挡和 2.5 mA挡,欧姆“×100”挡.则R +R =________ Ω,R =________ Ω. 1 2 4 答案:(1)480 Ω R (2)黑 (3)160 880 8 解析:(1)由半偏法原理知,灵敏电流计G的内阻为480 Ω;根据欧姆定律R== Ω= 6 000 Ω,所以变阻器选R .(2)当B端与“3”连接时,内部电源与外部电路形成闭合回路, 8 电流从A端流出,故A端与黑色表笔相连接.(3)根据题给条件可知,当B端与“2”连接时, R 、R 串联然后与表头并联,此时为量程1 mA的电流挡,由并联电路两支路电流与电阻 1 2 成反比知==,解得R +R =160 Ω,该电流表的内阻为R =120 Ω,当B端与“4”连接 1 2 内 时,表头与R 、R 并联后再与R 串联,此时为量程1 V的电压挡,1 mA电流表两端电压 1 2 4 为0.12 V,由串联电路中电压与电阻成正比知,R 两端电压为0.88 V,=,解得R =880 4 4 Ω. 3.探究小组学习欧姆表的工作原理和使用方法后,选择有关器材设计了图 a所示电路 进行欧姆表改装探究.请回答下列问题: (1)如图a,他们选择的电流表量程为0~0.6 A,内阻为0.1 Ω,滑动变阻器R的总阻值足够大,电源 E 的电动势为1.5 V,内阻为0.4 Ω,A端接________表笔(填“红”或 1 “黑”); (2)单刀双掷开关接1时为“×1”倍率,在该倍率下欧姆表调零时,滑动变阻器接入 电路的阻值为________ Ω; (3)探究小组用改装好的欧姆表(“×1”倍率)对一个未知电阻进行测量,经过正确的操 作步骤后,图b中指针为测量该电阻时对应的位置,则其对应的阻值为________ Ω; (4)探究小组设计单刀双掷开关接 2 时为“×10”倍率,则此时欧姆表的内阻为 ________Ω ,电源E 的电动势应为________V. 2 答案:(1)红 (2)2.0 (3)12.5 (4)25 15 解析:(1)根据电流红进黑出,B接线孔接黑表笔,则图中A端是红表笔;(2)根据欧姆 表的工作原理,欧姆表的内阻为R == Ω=2.5 Ω,则滑动变阻器接入电路的阻值为R 内 滑 =R -r -r=2.5-0.1-0.4(Ω)=2.0 Ω;(3)因为R =-R ,由图b可知I=0.10 A,因此 内 A x 内 R =-R =12.5 Ω;(4)根据表盘中刻度值为欧姆表内阻可知,接2时为“×10”倍率,此 x 内 时欧姆表的内阻为R =10×2.5=25 Ω,电源电动势E 为E=IR =15 V. 内2 2 2 g 内2
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  1. CONNECT:[ UseTime:0.000425s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000555s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000276s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000255s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000487s ]
  6. SELECT * FROM `set` [ RunTime:0.000188s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000597s ]
  8. SELECT * FROM `wendang` WHERE `id` = 120255 LIMIT 1 [ RunTime:0.000369s ]
  9. UPDATE `wendang` SET `liulancishu` = 9 WHERE `id` = 120255 [ RunTime:0.010480s ]
  10. UPDATE `wendang` SET `lasttime` = 1773088379 WHERE `id` = 120255 [ RunTime:0.000647s ]
  11. SELECT * FROM `wendang` WHERE `id` < 120255 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000368s ]
  12. SELECT * FROM `wendang` WHERE `id` > 120255 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001512s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 120255 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001563s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 120255 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001983s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 120255 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003274s ]
0.090846s