基于交流电路中平均值与有效值的分析

Analysis of the Average Value and Valid Value Based on AC Circuit

在交流电路中,电压、电流或功率值的大小,有时用有效值表示,有时用平均值表示,常把这两个概念混为一谈;笔者认为,交流电路中的电压、电流的有效值并非在任何情况下都等于其平均值,有功功率并非在任何情况下都等于平均功率;本文以整流电路为例,列举了几个不同的电路,详细地推导出计算有效电压、电流和有功功率,平均电压、电流及功率的正确表达式,并说明了他们的物理意义。

In an AC circuit,the value of the voltage,current or power sometimes use the valid value,sometimes use average value mean. The writer thinks that the valid value of the voltage and current in the AC circuit under not any circumstance all be equal to the average voltage,average current. The efficacy power to all be equal to the average power under all circumstances not. This text is to take commutate circuit as an example,enumerating a few different circuits,deducing an expression about valid voltage,valid current and efficacy power ,average voltage,average current and power,their physics meaning is explained.