当前位置:首页>文档>专题78 实验:探究变压器原、副线圈电压与匝数的关系 利用传感器制作简单的自动控制电路_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5

专题78 实验:探究变压器原、副线圈电压与匝数的关系 利用传感器制作简单的自动控制电路_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5

  • 2026-03-10 05:08:11 2026-03-10 05:08:11

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专题78 实验:探究变压器原、副线圈电压与匝数的关系 利用传感器制作简单的自动控制电路_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5
专题78 实验:探究变压器原、副线圈电压与匝数的关系 利用传感器制作简单的自动控制电路_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5
专题78 实验:探究变压器原、副线圈电压与匝数的关系 利用传感器制作简单的自动控制电路_4.2025物理总复习_2023年新高复习资料_专项复习_2023《微专题·小练习》·物理·新教材·XL-5

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专题 78 实验:探究变压器原、副线圈电压与匝数的关系 利用传感器制作简单的自动控制电路 1.[2022·湖北省恩施市期中]某校高二物理兴趣小组为探究变压器线圈两端电压与匝数 的关系,把没有用导线相连的线圈套在同一闭合的铁芯上,一个线圈连到学生电源的输出 端,另一个线圈连到小灯泡上,如图所示,请回答下列问题: (1)线圈应连到学生电源的________(填“DC”或“AC”)输出端; (2)某同学将与电源相连的线圈匝数增加,其余装置不变继续实验,灯泡亮度将 ________(填“变亮”或“变暗”),这说明灯泡两端的电压________(填“变大”或“变 小”); (3)在某次实验中,变压器原、副线圈的匝数分别为120匝和60匝,学生电源输出电压 为8.2 V,考虑到实际使用的变压器不是理想变压器,则用多用电表测得灯泡两端的电压 ________(填“大于”“等于”或“小于”)4.1 V. 2.某同学用热敏电阻制作高温报警器.实验器材如下,热敏电阻R 、电磁继电器、 x 蜂鸣器、小灯泡(额定电压2.5 V)、保护电阻r(阻值5 Ω)、变阻箱R(0~9 999.9 Ω)、电池 组两组(内阻不计)、多用电表(有温度挡)、铁架台、烧杯、开关及导线若干. (1)如图(a)所示是该热敏电阻的R t曲线,由图像可以得到热敏电阻的阻值随温度的 升高而________(选填“减小”“不变”或“增大”). (2)如图(b)是某同学设计的高温报警器电路图,左边部分是控制电路,右边部分是报警 装置,实验发现控制电路不工作,合上开关S,用多用电表排查电路故障,则应将如图(c) 所示的选择开关旋至________(选填“A”“B”“C”或“D”),若只有继电器线圈断路,则应发 现表笔接入继电器线圈两端时多用电表的指针________(选填“偏转”或“不偏转”),接 入热敏电阻两端时多用电表的指针________(选填“偏转”或“不偏转”).(3)根据电磁继电器的技术数据,当热敏电阻R达到设定温度时,电磁继电器应自动吸 t 合,报警装置报警.已知控制电路电池组电动势为6 V,实测电磁继电器正常吸合时的电 流为37.6 mA~40.2 mA,继电器内阻为61.0 Ω,如果设置报警温度为55 ℃,至少应将变 阻箱的电阻R调节到________ Ω.想要让热敏电阻在高温报警中更加“敏感”(即温度不是 太高就报警),需要________(选填“增大”“减小”或“不变”)变阻箱的电阻. 3.某同学通过实验制作一简易温控开关,实验原理图如图所示,当继电器电流超过 10 mA时,衔铁吸合,加热器停止加热,实现温控.继电器的电阻约为20 Ω,热敏电阻与 温度t的关系如下表所示. t/℃ 30.0 40.0 50.0 60.0 70.0 80.0 R/Ω 199.5 145.4 108.1 81.8 62.9 49.7 (1)提供的实验器材有: 电源E(3 V,内阻不计) 1 电源E(6 V,内阻不计) 2 滑动变阻器R (0~20 Ω,内阻不计) 1 滑动变阻器R (0~200 Ω,内阻不计) 2 热敏电阻R t 电阻箱(0~999.9 Ω) 开关S,导线若干 为使该装置实验对30~80 ℃之间任意温度的控制,电源应选________(选填“E”或 1 “E”);滑动变阻器选________(选填“R ”或“R ”). 2 1 2 (2)欲使热敏电阻为40 ℃时衔铁吸合,下列操作步骤正确的顺序是________. ①将热敏电阻接入电路 ②观察到继电器的衔铁被吸合 ③断开开关,将电阻箱从电路中移除 ④合上开关,调节滑动变阻器的阻值 ⑤断开开关,用变阻箱替换热敏电阻,将变阻箱电阻调至145.4 Ω A.⑤④②③① B.③⑤④②①C.①④⑤②③ D.④⑤②③① 
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  1. CONNECT:[ UseTime:0.000551s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000973s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000330s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000237s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000449s ]
  6. SELECT * FROM `set` [ RunTime:0.000188s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000531s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369804 LIMIT 1 [ RunTime:0.000361s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369804 [ RunTime:0.004736s ]
  10. UPDATE `wendang` SET `lasttime` = 1773090748 WHERE `id` = 369804 [ RunTime:0.001352s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369804 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000442s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369804 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000396s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369804 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003455s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369804 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001564s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369804 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012447s ]
0.098253s