1.电容器动态问题分析
2.电场与电场强度
3.库仑定律
4.电路中的电源
5.分压式和限流式对滑动变阻器的要求
6.探究感应电流的产生条件
7.磁通量
8.洛伦兹力与安培力的关系
9.螺旋测微器的原理与读数
10.游标卡尺的原理与读数
11.光电门的原理
12.追及相遇问题
13.小船过河
14.力的平行四边形定则演示实验
15.力的合成
16.动态平衡问题一
17.动态平衡问题二
18.向心加速度的方向
19.万有引力与重力的关系
20. 传送带问题
21.机械振动
22.简谐运动
23.单摆
24.受迫振动
25.共振
26.机械波
27.波的衍射
28.波的干涉
29.静电场
30.静电屏蔽
31.研究电荷分布
32.库仑扭秤实验
33.模拟电场线
34.测量等势线
35.探究电容大小的影响因素
36.氢原子模型
37.带电粒子在电场中的往复运动(一)
38.带电粒子在电场中的往复运动(二)
恒定电流
39.研究路端电压
40.探究欧姆定律
41.探究电阻的伏安特性曲线
42.探究小灯泡伏安特性曲线
43.用DIS研究小灯泡U-I图像
44.用DIS测电源电动势和内阻
45.灵敏电流计改装成电压表
46.半偏法测量电流表内阻
47.磁场
48.电流的磁效应
49.质谱仪
50.回旋粒子加速器
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赖受旺4377为什么分压式电路通常要选择电阻最小的那个滑动变阻器 有什么原理么 如果必要的话能用公式推导一下么? -
蓝劳叔18781033762 ______[答案] 举个例子说明吧1.R=100欧 与滑动变阻器10000欧分压连接,2.R=100欧 与滑动变阻器10欧分压连接..1中滑动变阻器从0-9900欧变化范围 只能另电压在0-0.5U左右变化,非常不便于调节2中滑动变阻器从0-10欧变化范围 可使电压...
赖受旺4377滑动变阻器分压接法为什么选小电阻 -
蓝劳叔18781033762 ______[答案] 因为实验用滑动变阻器长度约为30厘米 当阻值小时,单位长度上的阻值小. 当阻值大时,单位长度上的阻值大. 在滑动滑动头时,阻值大的可能因为没有移动就改变电流,这样就不能区分是因为移动造成的电流变化还是干扰造成的变化. 而电阻小时,...
赖受旺4377为什么用分压接法时,滑动变阻器应选阻值较小的 -
蓝劳叔18781033762 ______ 当选分压接法时,滑动变阻器的电流和你被分压的电阻的电压是一样的~为了变于调节,阻值小的滑动变阻器便于控制.如果你用太大阻值的,同样的移动可能改变很大的电阻,或许不好找到你需要的阻值那点~ 所以用小阻值的便于调节~也会方便你找需要的阻值点
赖受旺4377电学实验电路 分压式接法为什么分压式接法中,滑动变阻器要选择阻值小的,理论依据是什么?按道理用大电阻也可以呀.求教. -
蓝劳叔18781033762 ______[答案] 本人归纳几条分压式用小电阻的原因:1小电阻用来调节电压比较方便灵活.2分压式的原理:有一部分的滑动电阻与待测电阻并联,当滑动变阻器阻值很大的而待测电阻很小的时候,那么并联部分的总电阻就很小,所以分到的电压是很小的,不容易...
赖受旺4377分压电路选变阻器为什么要选电阻小的 -
蓝劳叔18781033762 ______ 在分压电路中和待测电阻并联部分的电压U=E-I(R-RX),待测电阻的阻值越大,滑动变阻器的阻值越小,分流越小,待测电阻组两端的电压随滑动变阻器作线性变化.所以,分压电路选变阻器为什么要选电阻小的.
赖受旺4377为什么分压接法要用阻值小的变阻器? -
蓝劳叔18781033762 ______ 阻值大与小,是相对而言,即相对于你所研究或者测量的电阻元件或者用电器而言. 采用分压式电路,要求接入电路中的滑到变阻器的阻值要小一些,这样,所测的电阻元件与滑动变阻器的一部分并联后,并联电阻与滑动变阻器的剩余部分可以比较,分压变化就比较明显. 若是采用阻值较大的滑动变阻器,则并联后的电阻较小,与剩余部分相比,占比很小,分压很少,这样就不容易比较了. 我可以举一个例子,你自己再研究一下, 若所测电阻元件阻值为10,所接入的滑动变阻器阻值为1000,电压为10v.试着计算一下几种情况下的分压情况
赖受旺4377分压式接法为什么选用小量程滑动变阻器 -
蓝劳叔18781033762 ______ 小量程=材料少=less money. 追问: 比如说半偏法测电流表的电阻的实验中,如果有多个 滑动变阻器 的话,一般选用量程小的. 回答: 小鹏 鹏、暴你菊花.应该就是便于调节.当然、有更好答案、记得告诉我. 补充: 半偏法、用大的,误差会大.
赖受旺4377滑动变阻器分压接法为什么选小电阻 -
蓝劳叔18781033762 ______ 因为实验用滑动变阻器长度约为30厘米 当阻值小时,单位长度上的阻值小.当阻值大时,单位长度上的阻值大.在滑动滑动头时,阻值大的可能因为没有移动就改变电流,这样就不能区分是因为移动造成的电流变化还是干扰造成的变化.而电阻小时,只有滑动头移动距离很大时才能引起电流变化.这样才能减小误差.
赖受旺4377分压式电路中为什么要用小量程的滑动变阻器?最好是公式推出来的原因.
蓝劳叔18781033762 ______ 小量程=材料少=less money. 半偏法、用大的,误差会大.
赖受旺4377高中物理电学实验电路分压式接法为什么分压式接法中,滑动变阻器要选
蓝劳叔18781033762 ______ 本人归纳几条分压式用小电阻的原因:1小电阻用来调节电压比较方便灵活.2分压式的原理:有一部分的滑动电阻与待测电阻并联,当滑动变阻器阻值很大的而待测电阻很小的时候,那么并联部分的总电阻就很小,所以分到的电压是很小的,不容易测量.
