当次级电路接通时，初级电流和次级电流都在铁芯内建立了一个磁通量。

When the secondary circuit is closed, both primary and secondary currents set up a flux in the core.

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当次级电路接通时，初级电流和次级电流都在铁芯内建立了一个磁通量。

When the secondary circuit is closed, both primary and secondary currents set up a flux in the core.

youdao