交流电的有效值与平均值是学生学习中很容易混淆的两个概念,因此在习题中如何应用这两个概念解决具体问题也是常常遇到的一个难点.本文对此简作分析并举例说明. 1.有效值:是从电流热效应的角度定义的物理量.让交流电和直流电通过同一纯电阻,如果在相同的时间内它们产生的热量相等,就把这个直流电的电压、电流分别叫做该交流电电压、电流的有效值。 The effective value and average value of AC power are two concepts that students can easily confuse in learning. Therefore, how to apply these two concepts to solving specific problems is also a difficult problem often encountered in the exercises. This paper analyzes this and gives an example. 1. Effective value: It is the physical quantity defined from the current thermal effect point of view. Let alternating current and direct current pass the same pure resistance. If they generate the same amount of heat in the same time, the voltage and current of this direct current are called the alternating current voltage, respectively. The effective value of the current.