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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艾伟荔3897分压电路和分压限流电路. -
厍绿春18083619257 ______ 1、描绘小灯泡的伏安特性曲线时,要求电压和电流必须从零开始测量,就必须用分压式.可以归结为:施药中要求从零开始测量的,就必须用分压式. 2、如果整个电路中,滑动电阻器比较小,对整个电路几乎没有影响的,也必须用分压式....
艾伟荔3897限流电路和分压电路是什麽样子的?
厍绿春18083619257 ______ 所谓分压电路是由一个滑动变阻器起到改变电压的目的的电路图.他可将其控制的分电路将电压由0调起,当题上要求电压有0起时,可用分压电路{变阻器并联] 限流电路是有一滑动变阻器串联在电路图中的电路.他起到限制电流的目的.但他不能将电压调至0. 二个电路图的变阻器的选取; 当提供的变阻器阻值较大时,可用于限流,阻值较小时,可用于分压. 80%的题都可用分压电路解决,几乎所有的限流都可用分压代替.当无法判断如何选取电路图时,请用分压电路,且选用较小变阻范围的变阻器》.
艾伟荔3897滑动变阻器分压式连接的原理 为什么可以分压 -
厍绿春18083619257 ______ 串联电路中,电流一定,电压和电阻成正比.变阻器的阻值可调,因此也能调整电压.
艾伟荔3897滑动变阻器的两种接法 -
厍绿春18083619257 ______ 分压,顾名思义是分去了电压.在电路中并联一个滑动变阻器.当变阻器的两个滑片在一起的时候,与电阻器并联的电路部分就被短路了,也就是说,那部分电路中没有电流通过.当两个滑片逐渐分开,与滑动变阻器并联的电路部分电压逐渐增大,当然电流也增大了.这就是分压电路的原理,可以看出电流可以从0一直增大到电源的输出电压. 限流电路就是串联一个滑动变阻器,通过改变整个电路中的电阻来改变电流. 两者主要区别在于分压电路的电流可以从0开始变化,而限流电路不可以.因此二者的选择主要根据题目中是否要求电路中电流从0开始变化.如果没有强调是否需要从0开始,一般选择分流式,因为这样消耗的电能比较少
艾伟荔3897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
厍绿春18083619257 ______ 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.
艾伟荔3897高中物理分压式电路疑问 -
厍绿春18083619257 ______ (2)你想 当Rx远大于R(滑动变阻器)时,(前提是限流式)无论滑动变阻器阻值怎么变化,Rx两端电压几乎不变,这样就没有作用了.所以要用分压式.(3)你想 如果限流式的额定电流都小于实际电路中的电流,电路就要烧坏了.所以要用分压式.希望对你又帮助吧,祝学习进步嗯.
艾伟荔3897为什么分压式电路要选择阻值较小的滑动变阻器呢?: - ) -
厍绿春18083619257 ______ 分压式电路是电源先与变阻器构成闭合回路,然后从变阻器的一端与滑动端之间引出电压. 为了能较大幅度的调节输出电压的能力,当负载电阻较小时,变阻器的电阻要更小才行. 所以通常要选择阻值较小的变阻器.
艾伟荔3897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? -
厍绿春18083619257 ______[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...
艾伟荔3897物理的分压式的电路为什么通过控制电阻就可以达到改变电压的效果?
厍绿春18083619257 ______ 分压式电路就是串联电路.因为串联电阻之比=电压之比,也就是U1 / U2=R1 / R2,所以控制电阻就可以达到改变电压的效果. 若还要问为什么 U1 / U2=R1 / R2,请追问,我来告诉你.
艾伟荔3897偏置电路的工作原理 -
厍绿春18083619257 ______ 偏置电路的工作原理: 由于流过发射极偏置电阻(Re)的电流IR远大于基极的电流Ib(Ie>>Ib),因此,可以认为基极电位Vb只取决于分压电阻Re的阻值大小,与三极管参数无关,不受温度影响. 静态工作点的稳定是由Vb和Re共同作用实现...
