交变电流有三种意义的数值,即峰值、瞬时值和有效值。所谓峰值是指交变电流在变化过程中能达到的最大值;瞬时值指变化过程中某一时刻的数值,它的大小不超过峰值;有效 The alternating current has three kinds of values, namely, peak value, instantaneous value and effective value. The so-called peak refers to the maximum value that the alternating current can reach during the change; the instantaneous value refers to the value at a certain moment during the change, and its size does not exceed the peak value;