The primary power supply is powered from the mains supply and energizes a lumped coil; the current ranges anywhere from 5 to125 amps.

主要的电力供给是来自市电电源并通过一个集合线圈激发；电流范围从5到125安培。

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Mains electricity in America is supplied as alternating current at 60 Hertz.

在美国，主要供应频率为60赫兹的交流电。

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Carrier current systems use the power line mains to transfer information between remote locations.

电力线载波通信系统利用电力线来实现远程数据传送。

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Their job is to convert high-voltage alternating current from the mains into low-voltage direct current for mobile phones, laptops, iPods and other electronic gadgets.

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