| 21. | Diodes are used in semiconductors to convert electricity from alternating to direct current.
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| 22. | The power output is supplied by 750 volt direct current through third rail.
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| 23. | It is a direct current, but it does not kill them.
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| 24. | Vibration of the top electrode caused the generation of direct current.
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| 25. | Edison favored direct current ( DC ) as an energy source.
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| 26. | A substation was located in Marienfelde converted the direct current into alternating current.
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| 27. | The line is completely electric, utilizing a 600V direct current system.
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| 28. | These lines were electrified with a direct current ( DC ) third rail.
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| 29. | DD1 locomotives operated off of 650 volt direct current from a third rail.
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| 30. | In the days of direct current series with the mains.
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