History of Electricity
Where it all began — from amber and static to Faraday's coils and the war of currents.
Why Start Here
Before touching a resistor or breadboard, I wanted to understand how we got here. Electricity wasn’t invented — it was slowly understood by a sequence of people building on each other’s work over centuries.
The Early Observations
- 600 BCE — Thales of Miletus rubs amber with fur and notices it attracts feathers. The Greek word for amber is elektron. That’s where the name comes from.
- 1600 — William Gilbert coins the term electricus and distinguishes electric from magnetic effects.
- 1745 — Pieter van Musschenbroek invents the Leyden jar — a glass jar coated inside and out with foil that stores static charge. First capacitor, essentially.
- 1752 — Benjamin Franklin’s kite experiment demonstrates lightning is electrical. He invents the lightning rod.
The Real Breakthrough: Current
Static charge is a party trick. Useful electricity means flow.
- 1800 — Alessandro Volta creates the voltaic pile — stacked zinc and copper discs separated by brine-soaked cloth. First battery. First sustained electric current. The unit Volt is named after him.
- 1820 — Hans Christian Ørsted accidentally notices a compass needle deflects when near a wire carrying current. Electricity and magnetism are connected.
- 1831 — Michael Faraday demonstrates electromagnetic induction — moving a magnet through a coil of wire generates current. This is the principle behind every generator and transformer today.
Maxwell and the Field
- 1865 — James Clerk Maxwell unifies electricity, magnetism, and light into four equations. Predicted electromagnetic waves before anyone had detected them.
Edison vs Tesla — The War of Currents
The most dramatic chapter.
- Edison built DC (direct current) systems. Great for short distances, but loses power fast over long wires. He had a business empire built on it.
- Tesla (backed by Westinghouse) championed AC (alternating current). AC voltage can be stepped up with transformers, transmitted efficiently over long distances, then stepped back down. Fundamentally better for a power grid.
Edison, threatened, ran a vicious PR campaign claiming AC was dangerous. He publicly electrocuted animals (including an elephant, Topsy) to “prove” it. He lost anyway.
By 1893 — AC powers the Chicago World’s Fair. By 1895 — Niagara Falls AC plant powers Buffalo, NY. The grid we use today is AC.
What Hit Me
The gap between “we noticed amber attracts feathers” and “we have a continental power grid” is about 2,500 years — but most of it happened in a single century (1800–1900). Once people understood that electricity could flow, progress was explosive.
The people who built the foundations — Volta, Faraday, Maxwell — were working without knowing what an electron even was. J.J. Thomson wouldn’t discover the electron until 1897.