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方程是由变量和表达式建立起来的等式,一些特定方程在求解有关物理问题方面有着重要作用,其中1/X=1/(X_1)+1/(X_2)就是典型一类.如初中物理中学过“并联电阻的总电阻倒数等于各支路电阻的倒数之和”的结论,符合这一方程的特征.以电阻 R 替代公式变量 X,即为求并联电阻的总电阻公式.这种由倒数之和关系建立起来的方程,本文中简称为“倒数和”方程.在高中物理知识中有大量满足“倒数和”方程的问题,只需抓住它们相似的条件特征,便能方便地运用这一规律.最为常见的是两项倒数和的方程.下面笔者以并联电阻电路为例,分析“倒数和方程”的特征条件.题目如图1所示,求电路中并联电阻 R_1、R_2的
Equation is an equation established by variables and expressions. Some specific equations play an important role in solving physical problems, of which 1 / X = 1 / (X_1) + 1 / (X_2) is typical. Secondary “parallel resistance total resistance countdown equal to the sum of the reciprocal of the resistance of each branch,” the conclusion, in line with the characteristics of this equation to the resistance R instead of the formula variable X, is the total resistance of the parallel resistance formula. In this paper, we simply refer to the “reciprocal and ” equation. There are a lot of problems in high school physics that satisfy “reciprocal and ” equation, just grab their similar conditional features , You can easily use this law. The most common is the reciprocal of the two equations and the following parallel to the author to the resistance circuit, for example, analysis of “reciprocal and equation ” characteristics of the conditions. Circuit in parallel with the resistors R_1, R_2