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根据目前考试大纲的要求,在交流电的三要素中。有效值应该是最被重视的一个量,综合学生在有效值问题上产生的错误,我认为教学中应突出下面几方面的要求,并采取一定的措施。1 紧抓定义在中学物理中,有效值是从热效应定义的:让交流电和直流电通过同样阻值的电阻,如果它们在相同时间里产生的热量相同,这一直流电的数值就叫做该交变电流的有效值。因此,在关于有效值的计算中必须从热效应相等出发。反之,在涉及热效应的问题中都必须采用有效值。
According to the requirements of the current syllabus, among the three elements of AC. The effective value should be the one most valued. Integrating students’ errors in the effective value problem, I think that teaching should highlight the following requirements and take certain measures. 1 The gripping definition is defined in the middle school physics. The effective value is defined by the thermal effect: AC and DC currents are passed through resistors of the same resistance. If they generate the same amount of heat at the same time, the DC value is called the AC current. The valid value. Therefore, it is necessary to proceed from the same thermal effect in the calculation of the effective value. Conversely, effective values must be used in issues involving thermal effects.