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我们知道,交流电的有效值是根据电流的热效应来规定的．让交流电和直流电通过相同阻值的电阻,如果它们在相同时间内产生的热量相等,就把这一直流电的数值叫做这一交流电的有效值．我们又知道,正弦交流电的有效值与最大值有如下关系:I=2~(1/2)/Im,U=2~(1/2)/Um 但我们不少同学在有效值求解时往往会出错误或感到无从人手,本文将通过五例来说明
We know that the effective value of AC is regulated by the thermal effect of the current. Let alternating current and direct current pass the resistance of the same resistance, if they produce the same amount of heat in the same time, then the value of this direct current is called the effective value of this alternating current. We also know that the effective value and the maximum value of the sinusoidal alternating current have the following relationship: I=2~(1/2)/Im, U=2~(1/2)/Um, but many of our classmates often solve the RMS value. There will be mistakes or feelings of incompetence. This article will illustrate five cases.