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.
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.
1831年，迈克尔·法拉第(Michael Faraday)发现，在一根电线内流动的电流会在邻近的一根电线内产生次级电流(secondary current)。
Michael Faraday discovered in 1831 that an electric current flowing in a wire induces a secondary current in a neighbouring wire.
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