A feud over twitching frog legs produced, in 1800, the first steady electric current.
Alessandro Volta invented the electric battery in 1800: the voltaic pile, a stack of alternating zinc and copper discs separated by brine-soaked cloth, produced the first steady electric current. It settled his feud with Luigi Galvani, whose twitching frog legs in the 1780s Volta had shown were caused by the metals touching them — not by 'animal electricity.'
Volta announced the pile in a letter to the Royal Society of London, and the news electrified Europe — literally: Napoleon summoned Volta to Paris, and scientists everywhere used the new current to decompose water, discover new elements and, within decades, build the telegraph. Stored electricity had entered the world.
In the 1780s Luigi Galvani, a Bologna anatomist, noticed dissected frog legs twitching when touched by two different metals during electrical storms — and concluded animals generated their own electricity, stored in the muscles. 'Animal electricity' became a sensation; Mary Shelley's Frankenstein (1818) would later draw on the era's electrical experiments with dead tissue.
Volta, a physics professor at Pavia, was skeptical. Through careful experiments he showed the twitch came from the bimetallic contact itself — the frog leg was merely the detector, a sensitive electroscope. The electricity was in the metals, not the animal. Galvani, gracious in defeat, died in 1798; Volta built the machine that proved him wrong.
Volta's pile was disarmingly simple: zinc disc, brine-soaked cloth, copper disc, repeated sixty times — and the stack pushed a continuous current through a wire. It was the first true battery: chemical energy converted directly and steadily into electricity, on a tabletop, without storms or friction machines — a portable, repeatable source of current no one had ever possessed.
The letter to the Royal Society, dated 20 March 1800, made Volta famous across Europe. Napoleon Bonaparte, fascinated, invited him to demonstrate the pile at the Institut de France in 1801, awarded him a gold medal and, in 1810, made him a count. The unit of electric potential — the volt — carries his name.
The voltaic pile faded fast — the brine dried, the zinc corroded — so the nineteenth century became a race for better batteries. John Daniell's 1836 cell, with copper and zinc in separate electrolytes, gave the telegraph its reliable power; Georges Leclanché's 1866 cell led to the dry cell in every flashlight; Gaston Planté's 1859 lead-acid battery was the first rechargeable, still starting cars today.
Each chemistry found its kingdom: the telegraph, the telephone exchange, the portable radio, the pacemaker. The battery became civilization's way of carrying electricity in its pocket.
The twentieth century's portable world ran on alkaline and then lithium: Sony's 1991 lithium-ion cell packed unprecedented energy into phones and laptops, and its inventors — John Goodenough, Stanley Whittingham and Akira Yoshino — shared the 2019 Nobel Prize in Chemistry. Rechargeable lithium now drives the electric car and stores solar power for the night.
Volta's stack of metal discs and wet cloth has become a trillion-dollar industry and the hinge of the energy transition. The frog legs are long forgotten; the pile never stopped growing.
