Who discovered electricity?
After fire, humanity’s second taming of energy: from Faraday’s coil to the grid — controlled burning becomes controlled current.
Last updated: October 2026
Nobody discovered electricity, because electricity was never lost. Lightning split the sky before humans existed, and amber, rubbed with cloth, has attracted dust since the first person tried it. What humans discovered — slowly, over two and a half centuries — was what electricity is, how to make it, how to store it, and how to put it to work. The story of electricity is not a single eureka. It is a relay race of experimenters, each handing the next a better question.
The relay runs from Thales of Miletus, who noticed amber's strange attraction around 600 BC, through William Gilbert, who named the effect; Benjamin Franklin, who proved lightning is electricity; Alessandro Volta, who built the first battery; Hans Christian Ørsted, who found that electricity makes magnetism; Michael Faraday, who turned magnetism back into electricity; James Clerk Maxwell, who wrote the equations that unified them; and Thomas Edison and Nikola Tesla, who fought over how to deliver it to the world. No one of them discovered electricity. Together, they tamed it.
The story begins with two ancient observations. Around 600 BC, the Greek philosopher Thales of Miletus noticed that amber, when rubbed with cloth, attracts small pieces of dust and straw. The Greek word for amber is elektron — and that is where the word electricity comes from. Separately, the Greeks and Chinese knew the lodestone, a natural magnet that attracts iron. For two thousand years, these two curiosities sat in the cabinet of natural wonders, unexplained and unconnected. Nobody suspected they were two faces of the same force.
The first systematic study came in 1600, when the English physician William Gilbert published De Magnete, one of the founding books of experimental science. Gilbert coined the term electricus for the amber effect, distinguished it from magnetism, and argued — against the scholastic wisdom of his day — that the Earth itself is a giant magnet. Gilbert's book is the moment electricity enters science as a subject rather than a curiosity. But Gilbert's electricity was still static: a charge that sits, attracts, and vanishes.
In the eighteenth century, electricity became the most fashionable science in Europe. Experimenters built glass rods, Leyden jars — the first capacitors, invented in 1745 — and machines that produced spectacular sparks. Parlour demonstrations drew crowds. Into this world stepped Benjamin Franklin, the American printer, diplomat, and natural philosopher, who in the 1740s and 1750s proposed a radical idea: that electricity is a single fluid, that there is a positive and a negative state of it, and — most daringly — that lightning is electricity on a grand scale.
Franklin's famous kite experiment of 1752, in which he flew a kite in a thunderstorm and drew a charge from the clouds, proved the point. Lightning, the terror of the ages, was the same phenomenon as the spark from a Leyden jar. Franklin's lightning rod — a metal rod that safely conducts a strike into the ground — was the first practical application of electrical science, and it spread across the world within years. Franklin did not discover electricity. He discovered that the sky and the laboratory obey the same law.
The next leap came from an argument. In the 1780s, the Italian anatomist Luigi Galvani noticed that a frog's leg twitched when touched by two different metals. He believed the twitch came from animal electricity. His countryman Alessandro Volta disagreed: the metals, not the frog, were the source. In 1800, Volta settled the argument by building the voltaic pile — a stack of alternating zinc and copper discs separated by brine-soaked cardboard — the first true battery, the first source of continuous electric current.
The voltaic pile changed everything. Static electricity had been a parlour trick, a spark that came and went. The pile delivered a steady current, on demand, in the laboratory. Within months, experimenters across Europe were using it: William Nicholson and Anthony Carlisle split water into hydrogen and oxygen by electrolysis in 1800; Humphry Davy used a giant pile at the Royal Institution to isolate new elements — sodium, potassium, calcium, and others — by passing current through molten salts. Chemistry and electricity became one science.
In 1820, the Danish physicist Hans Christian Ørsted made an observation that stunned Europe: when he switched on a current in a wire, a nearby compass needle twitched. Electricity and magnetism, which Gilbert had separated two centuries earlier, were connected after all. A current makes a magnetic field. Within weeks, André-Marie Ampère in Paris had worked out the mathematics of the forces between currents. The electromagnetic age had begun.
The decisive figure was Michael Faraday, a bookbinder's apprentice who became the greatest experimental physicist of the nineteenth century. In 1821, Faraday built the first electric motor — a wire rotating around a magnet. In 1831, he discovered electromagnetic induction: move a magnet near a coil, and a current flows. Induction is the principle behind the generator and the transformer, and therefore behind every power station on earth. Faraday, who had almost no formal mathematics, also gave physics its most powerful visual idea: the field — invisible lines of force filling space. When Faraday died in 1867, the world still ran on steam. Within a generation, it would run on his discoveries.
The theory that unified electricity and magnetism came from James Clerk Maxwell, a Scottish physicist who, in the 1860s, distilled everything known about the two forces into four equations. Maxwell's equations showed that electricity and magnetism are two aspects of a single electromagnetic field, and — most astonishingly — that waves in that field travel at the speed of light. Light itself, Maxwell argued, is an electromagnetic wave. The proof came in 1887, when Heinrich Hertz in Germany generated and detected radio waves in his laboratory, confirming Maxwell's prediction and opening the door to wireless communication.
Maxwell's unification is often ranked among the greatest achievements in the history of physics, alongside Newton's mechanics and Einstein's relativity. It also settled, in principle, what electricity is: not a fluid, not a mysterious effluvium, but a field — a property of space itself, governed by precise laws. Everything that followed, from the light bulb to the microchip, was engineering on Maxwell's foundation.
The last act of the nineteenth century was the fight over delivery. Thomas Edison, who had built the first practical incandescent light bulb in 1879 and the first commercial power station in New York in 1882, championed direct current — DC — which flows in one direction but loses power quickly over distance. Nikola Tesla, a Serbian-born inventor who had worked for Edison, championed alternating current — AC — which can be stepped up to high voltage, sent over long distances, and stepped down again with a transformer.
The War of the Currents, fought in the 1880s and 1890s between Edison's company and George Westinghouse's, which backed Tesla, was bitter and public — Edison even staged public electrocutions of animals to demonstrate the supposed dangers of AC. AC won, on the merits: it was the only practical way to power a city, let alone a continent. In 1896, the first large hydroelectric plant at Niagara Falls began sending AC power to Buffalo, twenty miles away, and the modern grid was born. The light bulb made electricity desirable. The grid made it universal.
Electricity is now the nervous system of civilization. It lights, heats, cools, computes, and communicates; the entire digital world — every phone, server, and satellite — runs on controlled current. The generation of electricity is also the central problem of the twenty-first century: most of it still comes from burning fossil fuels, and the transition to wind, solar, hydro, and nuclear power is the defining engineering project of our time.
The story that began with amber and a kite has come full circle. Franklin proved that lightning and laboratory sparks are one. Volta bottled the current. Faraday and Maxwell explained it. Edison and Tesla delivered it. The discovery of electricity was not a moment. It was a two-and-a-half-century relay — and the baton is still being passed.
- Encyclopaedia Britannica, “Electricity” and biographies of Franklin, Volta, Faraday, and Maxwell.
- Faraday, Michael, Experimental Researches in Electricity.
- The Royal Institution, London, histories of Davy and Faraday.
- The Science Museum, London, histories of electricity and the grid.
- Jonnes, Jill, Empires of Light: Edison, Tesla, Westinghouse, and the Race to Electrify the World.