次级绕组指变压器中不直接跟交流电源连接的绕组。通过电磁感应将在此绕组上感应出电 压，从而为直流电源提供所需的交流电压。电源变压器可以有几个次级绕组，从而可增加多个用电电源的器件（电路）之间的隔离。
增加次级绕组和电路可以获得多个输出。
Multiple outputs are possible with additional secondary windings and circuits.
因为次级绕组通常输入高阻抗的电路，因此次级电流很小。
Since the secondary winding is normally operated into a high-impedance circuit, the secondary current is quite small.
采用变磁阻法改变初级线圈的磁通，在次级绕组上得到相应的感应电势。
The induced electromotive force at the secondary coil can be got by changing the flux of the primary coil.
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