Tesla Notes 11: The High-Frequency Alternator (1890)
Tesla builds a dynamo with 384 poles to reach ten thousand alternations a second, silences the arc lamp, and finds the current hiding in the skin of the copper.
Tesla works out how many poles make 10,000 alternations a second, why the iron must be wire, and why copper carries current only in its skin.
Nikola Tesla
November 5, 2026
29 min