论文部分内容阅读
[实验目的]练习使用多用电表测电阻.[实验原理]1.欧姆表是根据闭合电路欧姆定律制成的.其电路如图1,R是可变电阻,也叫调零电阻.红黑表笔短接,进行欧姆表电阻调零,表头指针满偏,有:I_(?)=(?)/R_(?)+R+r红、黑表笔间接入某一电阴R_x时,有:I=(?)/R_(?)+R+r+R_x可见每一个R_x都有一个对应的电流值I.我们在刻度盘上直接标出与I对应的R_x的值,那么当红、黑表笔分别接触待测电阻的两端,就可以从表盘上直接读出它的阻值.
[Experimental purpose] Practice using a multimeter to measure the resistance. [Experimental principle] 1. The ohmmeter is made according to the closed circuit Ohm’s law. The circuit is shown in Figure 1. R is a variable resistance, also called zero resistance. Red and black table pens Short-circuit, ohmmeter resistance zero, head pointer full bias, there are: I_ (?) = (?) / R_ (?) + R + r red, black table pen to access a certain cathode Yin R_x, there are: I=(?)/R_(?)+R+r+R_x It can be seen that each R_x has a corresponding current value I. We directly mark the value of R_x corresponding to I on the dial, then when the red and black pens By touching the two ends of the resistance to be measured, it can directly read its resistance from the dial.