如图12—12所示,电阻R,和R2串联在电路中,现在要计算出RZ的阻值,

如图12—12所示,电阻R,和R2串联在电路中,现在要计算出RZ的阻值,图中所标出的物理量中至少需要知道哪几个量?如何计算?参考表中的示例填写表格(写出两种计算方法).

 

 

图12—12

 

 

 

答案

 

 解析:略

 

相关题目

三个12 cm×12 cm的正方形都被连结两条邻边的中点的直线分成A
三个12 cm×12 cm的正方形都被连结两条邻边的中点的直线分成A、B两片,如图(1);把6片粘在一个正六边形的外面,如图(2);然后折成多面体,如图(3).在此多面体
如图7所示,一束光射向凸透镜经折射后射到一个平面镜上.
如图7所示,一束光射向凸透镜经折射后射到一个平面镜上.请在图中画出射向凸透镜的入射光线和经平面镜反射后的反射光线,并标出反射角的度数.
实验室利用图1实验装置进行有关化学实验,回答下列问题:
实验室利用图1实验装置进行有关化学实验,回答下列问题: (1)写出图1中仪器甲、乙的名称:甲 ,乙(2)实验室用氯酸钾制取氧气,发生装置可选
已知平面向量满足:的夹角为.若中,为边的中点,则=(   ) A.
已知平面向量满足:的夹角为.若中,为边的中点,则=(   ) A.     B.      C.      D.
如图所示电路中,灯LA、LB完全相同,带铁芯的线圈L的电阻可
如图所示电路中,灯LA、LB完全相同,带铁芯的线圈L的电阻可忽略,则:A.  S闭合瞬间,LA、LB同时发光,接着LA熄灭,LB更亮B.  S闭合瞬间,LA不亮,LB立
Louie was my neighbor. He was a strong man with powerful hands. One day, when I
Louie was my neighbor. He was a strong man with powerful hands. One day, when I saw him brush the dirt off a child’s injured knee, I was shocked by his kindness. Over time, I found that he was attra
小明的爸爸随南极科考队赴南极进行科学考察。临行前,小
小明的爸爸随南极科考队赴南极进行科学考察。临行前,小明想为爸爸带一只温度计以便测量南极的气温。听爸爸说南极的最低气温可达-94.5℃,下表
When the clerk at the counter was rude to her, she rings Tony up and told the cl
When the clerk at the counter was rude to her, she rings Tony up and told the clerk to speak to him.      

最新题目