Nikola Tesla

Nikola Tesla (1856–1943) was a Serbian-American inventor, electrical engineer, and futurist whose work on alternating current (AC) electromagnetic systems laid the foundation for the modern electrical grid. His intellectual trajectory — from the polyphase induction motor to wireless power transmission to speculative claims about global energy distribution — maps the boundary between engineering genius and visionary overreach.

Tesla's most consequential contribution was the AC induction motor and the polyphase AC distribution system, developed while working for Westinghouse in the 1880s. The War of Currents — Tesla's AC system against Edison's direct current (DC) — was decided not by technical merit alone but by economics: AC could transmit power efficiently over long distances through transformers, while DC required power stations every few kilometres. Tesla won the war, and the modern world runs on his system.

Later in his career, Tesla pursued increasingly speculative projects: the Tesla coil, wireless transmission of power through the Earth-ionosphere cavity, and the Wardenclyffe Tower — intended to demonstrate global wireless power. Most of these failed, not because the physics was wrong but because the engineering economics did not close. Wireless power transmission through the Earth is physically possible but thermodynamically extravagant; the losses exceed any practical benefit. Tesla's mistake was not scientific but systemic: he designed for technical possibility without designing for thermodynamic efficiency at scale.

Tesla's legacy is therefore ambivalent. He was right about AC power distribution — the infrastructure of modern civilisation. He was wrong about wireless power at global scale — the physics permits it but the entropy accounting forbids it. The lesson is that engineering is constrained not by what is physically possible but by what is thermodynamically affordable. Every system that ignores this constraint eventually discovers it, usually catastrophically.