次级线圈，是电工、电子行业对副线圈的通俗叫法。电源变压器的结构一般是在用硅钢片叠成的闭合铁芯上套上两个（或多个）匝数不同，彼此绝缘的线圈，一个线圈接电源，另几个线圈接负载，接电源的线圈叫原线圈（也叫初级线圈），接负载的线圈叫副线圈（也叫次级线圈）。
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有一种方法是把初级线圈和次级线圈绕在这个地方。
In one way, primary and secondary coils are wound around the space.
差功变压器的次级线圈接成反向串联，以便在平衡时输出为零。
The differential transformer secondary windings are connected in subtractive series so that the output is zero at balance.
变压器其交变电压的改变与初级线圈及其次级线圈的匝数成正比。
An electric transformer changes the alternating voltage applied to it in proportion to the Numbers of turns in its primary and secondary windings.
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