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交流电在工农业生产及人类生活中有着广泛的应用。学好交流电知识显得很有必要,而弄清交流电“四值”即瞬时值、最大值、有效值和平均值的区别和联系及其应用是本章重点之一,现归纳整理如下,供大家参考。1“四值”概念归纳瞬时值:交流电的瞬时值反映的是不同时刻交流电的大小和方向。瞬时值是时间函数,不同时刻,瞬时值不同。要注意①写瞬时表达式时,线圈转动从什么位置开始计时;②瞬时值与线圈在磁场中的位置对应关系;③牢记线圈在中性面和与磁感线平行这两个特殊位置时,e或i、
AC has a wide range of applications in industrial and agricultural production and human life. It is very necessary to learn the knowledge of AC, and to find out the difference and connection between the “four-valued”, ie instantaneous value, maximum value, effective value and average value of the AC, is one of the focuses of this chapter. reference. The 1“four-value” concept summarizes the instantaneous value: the instantaneous value of the alternating current reflects the size and direction of the alternating current at different times. The instantaneous value is a function of time. At different times, the instantaneous value is different. It should be noted that 1 when writing the instantaneous expression, the position from which the coil rotates starts timing; 2 the correspondence between the instantaneous value and the position of the coil in the magnetic field; 3 keep in mind that when the coil is in the neutral plane and the magnetic induction line are two special positions, e or i,