It is common for the direct current circuit to be interfered by alternating current voltage.

直流回路受到交流电压干扰，是控制回路中容易产生的现象。

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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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Large-scale electricity transmission usually uses alternating current, in which both current and voltage oscillate.

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High-voltage DC can carry power over long distances at lower cost than alternating current, but the transformers still cost too much to make the idea widespread.

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