| 11. | Rotary style may be driven by direct current or alternating current electricity source.
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| 12. | Is that what Edison called it, as opposed to direct current?
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| 13. | :There is also the issue of alternating current and direct current.
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| 14. | The high-voltage direct current line runs without creating strong electromagnetic fields, he said.
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| 15. | Special direct current filters are used to eliminate high frequency interference.
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| 16. | He revisits the War of Currents rivalry between Direct current and Alternating current.
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| 17. | The line was electrified using the direct current system in 1923.
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| 18. | Conductive coupling passes the full spectrum of frequencies including direct current.
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| 19. | In 1920 it was electrified at 4, 000 V direct current.
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| 20. | Current is collected via a pantograph, at 750 volts direct current.
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