Alternating current and direct current
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An outline of the difference between alternating and direct current; why AC is in general use; how DC can be produced from AC; and the reasons why one or the other is used for particular purposes. The film also shows why high tension AC is preferable to low tension DC for transmission purposes.
Sources
- 16mm Filmography (legacy record) — title, description, catalog record
Original permalink · Record added 2026-01-23 03:13:46