论文部分内容阅读
在高中电学实验教学时,利用中学现有的仪器及学生所掌握的相关知识,可以设计多个测量电阻Rx的电路,下面谈谈测量电阻的几个常用方法.1.伏安法伏安法测Rx的原理是,用安培表把流过Rx的电流I测出来,用电压表把Rx两端电压U测出来,再根据欧姆定律(RX=U/I)将Rx求出来.根据这一原理,在设计测量电路时,必须有电压表和安培表,同时还要满足三个条件:第一,选好电压表、安培表的量程,量程太大或太小,都会违反读数原则;第二,正确选择安培
In the high school electrical experiment teaching, using the existing equipment of the middle school and the relevant knowledge of the students, a plurality of circuits for measuring the resistance Rx can be designed. The following are some common methods for measuring the resistance. 1. Voltammetry voltammetry The principle of measuring Rx is to use an ampere meter to measure the current I flowing through the Rx, measure the voltage U across the Rx with a voltmeter, and derive Rx according to Ohm’s law (RX = U/I). Principle, in the design of the measurement circuit, there must be a voltmeter and ammeter, while also meeting three conditions: First, select the voltmeter, ammeter range, too large or too small, will violate the principle of reading; Second, the correct choice of amps