An electric transformer changes the alternating voltage applied to it in proportion to the numbers of turns in its primary and secondary windings. 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。
The number of turns of wire in the secondary coil is the same as the number of turns in the primary. 次级线圈的圈数和初线线圈圈数一样。