The design is adapted for manufacturing various alternating current-direct current electromagnetic relays.

该设计适用于制造各种交直流电磁继电器。

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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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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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Even Thomas Edison bet badly, as in his development of direct-current electricity that proved inferior to alternating current.

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