Then
His AC fought Edison’s direct current in the “War of the Currents”, and AC won — powering factories and cities and enabling hydroelectric power at Niagara.
Timeline of Discovery · 22 / 30
Nikola Tesla
1856 - 1943 · Serbian-descent engineer in the USA
Nikola Tesla championed alternating current, building the motor and system that made long-distance electricity practical and powering the modern grid.
- Physics
- Technology
- Industrial & Modern
Lived
1856 - 1943
Era
Industrial & Modern
Primary field
Physics
Signature idea
Invented alternating current (AC) power system
Their place in history
1856 - 1943
The question they asked
Which current can deliver electricity safely and efficiently over long distances — and can it rotate machines without brushes?
The Contribution
What this scientist actually did — precisely and plainly.
He invented the induction motor and the polyphase alternating-current system, and his ideas underpinned long-distance power distribution.
How the Work Advanced Knowledge
The tools, experiments and reasoning behind the discovery.
He combined physical intuition with relentless experimentation and built working demonstrations, famously lighting lamps wirelessly in his New York lab.
Why It Mattered Then / Today
From their own moment in history to the world we live in now.
Today
Almost every home and industry runs on alternating current; his motor and coil concepts appear in motors and wireless technologies still studied today.
Important Works or Discoveries
Landmarks that carried the idea into the world.
- The alternating-current induction motor
- The Tesla coil
- Polyphase AC power distribution
The present is theirs; the future, for which I really worked, is mine.
Sources
Where this profile was verified.
Last reviewed: 2026-09-22
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