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初中物理中,电学部分占很大比重。电路的分析和计算方法贯穿整个电学,对初中学生来说感到困难也是合理的。电学计算题虽然种类繁多,题型多样,但还是有规律可循的,下面笔者将结合题目谈谈求解此类题的规律与方法。一、推导法公式推导题是电学题中比较简单的题型,基本就是利用一个公式中的三个物理量之间的关系,给出其中两个物理量,求解第三个量。给出串、并联电路中电流、电压、电阻的关系,求解未知量。例1在如图1所示的电路中,R_1=10Ω,
Middle school physics, the electrical part of a large proportion. Circuit analysis and calculation methods throughout the electrical, junior high school students feel it is also reasonable. Although a wide range of electrical calculation questions, questions varied, but there are still rules to follow, the author will discuss the following topics to discuss the rules and methods of such questions. First, the deduction of the formula deduction is the electrical problem is relatively simple question type, the basic is to use a formula in the relationship between the three physical quantities, given two physical quantities, the third solution. Given the string, parallel circuit in the current, voltage, resistance, the relationship between unknown quantities. Example 1 In the circuit shown in Figure 1, R_1 = 10Ω,