初级线圈，主线圈，原线圈

1. 原线圈：图3所示是一个简易的近距离无线供电系统的结构图. 其中原线圈(primary coil)、原磁心(Primary Core)及其控制电路构成了发射端. ...

2. 初级线圈：大家都知道 , 变压器的工作原理是依靠初级线圈 (primary coil) 透过铁芯造成电磁感应从而使次级线圈 (secondary coil) 产生与这两组线圈的匝数比例成正比的电压.

3. 一次线圈：Pre-test 初探 | Primary coil 一次线圈 | Primary radiation 初级辐射

4. 原线圈,初级线圈：primary cell 原电池;一次电池 | primary coil 原线圈,初级线圈 | primary color 原色

noun

1. coil forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit

e.g. current through the primary coil induces current in the secondary coil

Synonym: primary windingprimary