Tesla Notes 05: The Transformer and the Ratio of Turns (1885 to 1888)
A converter has no moving part and turns a thousand volts into fifty as quietly as a sum is carried in the head. I wanted to know exactly why.
Why a transformer needs alternating current: the ratio of turns, V = 4.44 f N Φ, magnetising current, eddy losses and laminations, worked in Tesla's voice.
Nikola Tesla
November 5, 2026
29 min