The system generates a direct current, so using it to power DC devices locally is more efficient than switching to the alternating current needed to feed it back to the grid.

该系统产生的电流为直流电，所以用来驱动本地的直流点装置比将其转化为交流电输入电网来的更有效率。

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Diodes are electronic devices which rectify alternating current to direct current.

二极管是将交流电整流成直流电的电子装置。

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The disadvantage is that reverse electrodialysis produces direct current, whereas the world runs mostly on alternating current.

不足处是反向电渗析产生的是直流电，而世界上主要使用交流电。

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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.

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Traditional inverters gather power from all or most of the panels in an installation and use transformers, capacitors and switches to change it from direct current to alternating current.

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They can carry five to 20 times more current in the same unit area while reducing the amount of energy lost as heat by 75-97% (depending on whether the current is alternating or direct), even after accounting for all the nitrogen-cooling paraphernalia.

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