30.0 | 40.0 | 50.0 | 60.0 | 70.0 | 80.0 | |
199.5 | 145.4 | 108.1 | 81.8 | 62.9 | 49.1 |
为使该装置实现对30~80 ℃之间任一温度的控制,电源E应选用
(2)实验发现电路不工作.某同学为排查电路故障,用多用电表测量各接点间的电压,则应将如图11–2图所示的选择开关旋至
(3)合上开关S,用调节好的多用电表进行排查,在题11–1图中,若只有b、c间断路,则应发现表笔接入a、b时指针
(4)排除故障后,欲使衔铁在热敏电阻为50 ℃时被吸合,下列操作步骤正确顺序是
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,用电阻箱替换热敏电阻,将阻值调至108.1 Ω
相似题推荐
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748471410327552/2750515367067648/STEM/62004cb5-1f07-48d0-ab4f-eb3dbe1b1f31.png?resizew=561)
(1)某同学用多用电表测量电阻,电路如图甲所示,若选择开关置于“×100”挡,按正确使用方法测量电阻Rx的阻值,指针位于图乙所示位置,则Rx=
(2)若该欧姆表使用一段时间后,电池电动势变小,内阻变大,但此表仍能调零,按正确使用方法再测上述Rx,其测量结果与原结果相比将
(3)某同学利用图甲中的器材设计了一只欧姆表,其电路如图丙所示。
某同学进行如下操作:当Rx未接入时,闭合开关S,将红、黑表笔分开时,调节可变电阻,使电流表满偏。当Rx接入A、B表笔之间时,若电流表的指针指在表盘的正中央,则待测电阻Rx的阻值为
(1)某同学使用多用电表的欧姆挡粗略测量一定值电阻的阻值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433dcc3561f37ba58464c33fd4a238b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/608cbac1845d56f3859c5c9ab6c5efdf.png)
a.将两表笔短接,调节欧姆挡调零旋钮,使指针对准刻度盘上欧姆挡的零刻度,然后断开两表笔
b.旋转选择开关至交流电压最大量程处(或“OFF”挡),并拔出两表笔
c.将选择开关旋到“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51ff6f4530cce16256481c85e703839.png)
d.将选择开关旋到“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1972314b90b71b03774f75bad5b7837c.png)
e.将选择开关旋到“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c91be18461bb19d97819f137a2934a3.png)
f.将两表笔分别连接到被测电阻的两端,读出阻值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433dcc3561f37ba58464c33fd4a238b0.png)
以上实验步骤中的正确顺序是
(2)重新测量后,指针位于如图2所示位置,被测电阻的测量值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
![](https://img.xkw.com/dksih/QBM/2019/4/27/2191558629212160/2192234843201537/STEM/14b87244-4267-48eb-8a8e-6d1a9b2e2ace.png?resizew=576)
(3)如图3所示为欧姆表表头,已知电流计的量程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c330c9bcf6d0487e1618012092253d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc51fb33ae6222015a3c758d8dbd2d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f55e90f1953aa61fb71c587b009fe83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7537c9f066135c17a11b80daca3fb16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f55e90f1953aa61fb71c587b009fe83.png)
![](https://img.xkw.com/dksih/QBM/2019/4/27/2191558629212160/2192234843201537/STEM/a111eaad-9fc8-4f44-aaa4-60dbda62a5be.png?resizew=539)
(4)为了较精确地测量另一定值电阻的阻值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec7090edb9ff9722ae70ae4a2548bc7.png)
①用多用电表测电路中的电流,则与a点相连的是多用电表的
②闭合电键,多次改变电阻箱阻值R,记录相应的R和多用电表读数I,得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b285e4b19272ebe9a3be3d0a1a40114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec7090edb9ff9722ae70ae4a2548bc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f0c34d6771a83d8eed366b78fdfb526.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3a1e976dc7ccea4600a8ad1121760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d55519bd96aba05e6f1533ddc7bb63fa.png)
(2)将单刀双掷开关S与2接通后,先短接,再欧姆调零。两表笔再与一电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c1313842b62428737610b14806d883.png)
(3)该同学进一步探测黑箱问题。黑箱面板上有三个接线柱1、2和3,黑箱内有一个由三个阻值相同的电阻构成的电路。用欧姆表测得1、2之间的电阻为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b132e0cbd0e446630f4bb65804ce581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d757a8853133814c9a9753443c1cf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b49bd50cc6fc1307c907c8e5bc953de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/22/2cceba70-8979-44c4-9134-44f3bdac6810.png?resizew=484)
(1)图甲为某同学设计的电流表、电压表两用表的电路图,已知电流计G的量程是300mA,内阻是220Ω,电阻R1=11Ω,R2=100Ω,则选择开关接到
(2)某同学用多用电表测量电阻时采用“×100”倍率,结果多用电表表盘指针位置如图乙中虚线所示,为了测量更加准确,这时应该采用
(3)一个多用电表的电池用久了,电动势由1.5V降成1V,内阻r由1.5Ω变成5Ω,现用此电表欧姆调零后测量一未知电阻,测得Rx=240Ω,则其真实值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f783bc39a1369c728404e8ec215698e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f783bc39a1369c728404e8ec215698e.png)
(1)小明从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f783bc39a1369c728404e8ec215698e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478abdd84506a8ef759e353a238db6c9.png)
![](https://img.xkw.com/dksih/QBM/2021/5/20/2725135692718080/2725189859024896/STEM/77fb4959-55a4-4683-af05-790a24695f75.png?resizew=617)
(2)小明根据粗测结果设计电路,并根据电路图连接实物如图乙1所示,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f783bc39a1369c728404e8ec215698e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f783bc39a1369c728404e8ec215698e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a846fc50ceb5971dac54206b6600946.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e43cca5751eff3d24b64cb51006d6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a10353eb53b3fbac1a0c0734d95f0a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478abdd84506a8ef759e353a238db6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258e40e3883271c3580c1d3c805dcac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
![](https://img.xkw.com/dksih/QBM/2021/5/20/2725135692718080/2725189859024896/STEM/22f189c5-494f-45cd-b2c3-2a5b98730fc4.png?resizew=437)
(1)某同学使用多用电表的欧姆挡粗略测量一定值电阻的阻值Rx,先把选择开关旋到“×10”挡位,测量时指针偏转如图所示.以下是接下来的测量过程:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/bb21f1c3-022f-4b7c-943d-42dcc503c98e.png?resizew=360)
a.将两表笔短接,调节欧姆挡调零旋钮,使指针对准刻度盘上欧姆挡的零刻度,然后断开两表笔
b.旋转选择开关至交流电压最大量程处(或“OFF”挡),并拔出两表笔
c.将选择开关旋到“×1”挡
d.将选择开关旋到“×100”挡
e.将选择开关旋到“×1k ”挡
f.将两表笔分别连接到被测电阻的两端,读出阻值Rx,断开两表笔
以上实验步骤中的正确顺序是
(2)重新测量后,指针位于如图所示位置,被测电阻的测量值为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/aadce10f-6fd9-4b4d-8752-3e6351500bfd.png?resizew=337)
(3)如图所示为欧姆表表头,已知电流计的量程为Ig=100μA,电池电动势为E=1.5V,则该欧姆表的内阻是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/3f1fa272-392b-40e3-afbf-eb0eddedefb8.png?resizew=175)
(4)为了较精确地测量另一定值电阻的阻值Ry,采用如图所示的电路.电源电压U恒定,电阻箱接入电路的阻值可调且能直接读出.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/9d54e721-cc26-4f57-8c68-feaedbc9841d.png?resizew=180)
①用多用电表测电路中的电流,则与a点相连的是多用电表的
②闭合电键,多次改变电阻箱阻值R,记录相应的R和多用电表读数I,得到R-
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963a73a661a554bbf37cc74d702ccea0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/c666dda0-d1e5-4fbe-a92b-7824b26f99b5.png?resizew=211)
(5)一半导体电阻的伏安特性曲线如图所示.用多用电表的欧姆挡测量其电阻时,用“×100”挡和用“×1k”挡,测量结果数值不同.用
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/c2ccc416-5cab-48fc-8eac-cb9f9afb00ed.png?resizew=158)