107交变电流的产生、变化规律及四值的相关计算(1)精讲精练-2022届高三物理一轮复习疑难突破微专题
107交变电流的产生、变化规律及四值的相关计算一.必备知识1.交变电流(1)定义:大小和方向均随时间做周期性变化的电流叫作交变电流。(2)图像:用以描述交变电流随时间变化的规律,图a、b、c、d所示电流都属于交变电流,其中按正弦规律变化的交变电流叫作正弦式交变电流,简称正弦式电流,如图a所示。2.正弦式交变电流的产生和变化规律(1)产生:在匀强磁场中,线圈绕垂直于磁场方向的轴匀速转动产生的电流是正弦式交变电流。(2)中性面①中性面:与磁感线垂直的平面称为中性面。②中性面的特点以及与峰值面(中性面的垂面)的比较图示位置中性面位置与中性面垂直的位置特点B⊥SB∥SΦ=BS,最大Φ=0,最小e=n=...
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