交流阻抗 alternating-current impedance 交流电网，交流电源，交流干线 alternating-current mains 交流测量 alternating-current measurement ..
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alternating current mains 交流馈电线
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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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.
ECONOMIST: How a boring gadget saved $2 billion-worth of electricity
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