Nikola Tesla — The Inventor Who Electrified the World

The Priest's Son from Smiljan

Nikola Tesla was born on 10 July 1856 in Smiljan, a village in the Military Frontier of the Austrian Empire (now in Croatia). His father, Milutin Tesla, was a Serbian Orthodox priest and writer. His mother, Đuka Mandić, was unschooled but highly intelligent — she invented several household tools and had an extraordinary memory, able to recite entire Serbian epic poems.

Tesla was the fourth of five children. His older brother Dane was considered the family's star, but in 1863, seven-year-old Nikola witnessed Dane's death in a horse-riding accident. The trauma profoundly affected Tesla, who reported experiencing vivid flashes of light and hallucinations from that point forward — episodes that would recur throughout his life.

His uncle Josif was a lecturer at a military academy who wrote several textbooks on mathematics. Tesla credited his eidetic memory and creative abilities specifically to his mother's genetics and influence.

An Extraordinary Mind

From an early age, Tesla displayed an unusual ability to visualise objects and machines in complete detail in his mind, rotating them and testing them mentally before ever building a physical model. He later called this his "mental laboratory." This gift of eidetic imagery became his primary method of invention — he rarely sketched designs on paper, instead constructing and refining them entirely in his imagination.

Tesla attended primary school in Smiljan and later the Higher Real Gymnasium in Karlovac, where he completed the four-year course in three years, graduating in 1873. He reported that his physics teacher's demonstrations of electricity were the inspiration for his career. He contracted cholera shortly after graduation and was bedridden for nine months, nearly dying.

Eccentricities and Personal Life

Tesla was a lifelong bachelor who claimed his chastity was helpful to his scientific work. He had few close friends but counted among them Mark Twain, who spent considerable time in Tesla's laboratory and described his induction motor as "the most valuable patent since the telephone." In 1896, Tesla met the Indian Hindu monk Swami Vivekananda at a party hosted by actress Sarah Bernhardt. The meeting stimulated Tesla's interest in Eastern philosophy, and he later wrote an article titled "Man's Greatest Achievement" using Sanskrit terms to describe the relationship between matter and energy.

Tesla became a vegetarian in his later years, living on milk, bread, honey, and vegetable juices. He had numerous phobias and compulsions: he was obsessed with the number 3, washed his hands compulsively, and could not tolerate touching human hair. He had a special aversion to pearls and would refuse to speak to women wearing them.

He was critical of Einstein's theory of relativity, calling it "a beggar wrapped in purple whom ignorant people take for a king" and claiming in 1935 to have measured cosmic rays traveling at fifty times the speed of light.

University and the Rotating Field

In 1875, Tesla enrolled at the Austrian Polytechnic in Graz on a Military Frontier scholarship. In his first year, he earned the highest grades possible, never missed a lecture, and passed nine exams — nearly double the required number. He claimed to need only three to four hours of sleep per night.

During his second year, Tesla clashed with a professor about the inefficiency of the Gramme dynamo, a direct-current machine that used commutators and brushes that sparked. Tesla argued that a motor could be designed without commutators — an idea his professor dismissed as impossible, likening it to building a perpetual motion machine. The challenge consumed Tesla for the next six years.

In his first year at Graz, the dean of the technical faculty wrote to his father: "Your son is a star of first rank." But by his third year, Tesla was failing — one biographer suggests he may have been expelled for gambling. He left Graz in December 1878 without graduating. His family did not hear from him; there was a rumour he had drowned in the nearby river Mur. He was eventually found working as a draftsman in Maribor for 60 florins per month.

His father died on 17 April 1879, at the age of 60. In January 1880, two of Tesla's uncles paid for him to go to Prague, but he arrived too late to enrol at Charles-Ferdinand University. He had never studied Greek, a required subject, and was illiterate in Czech, also required. He audited philosophy lectures without receiving grades.

The Park in Budapest — February 1882

In 1881, Tesla moved to Budapest to work for the Central Telegraph Office, where he became chief electrician and made improvements to telephone equipment. It was during a walk in Budapest's City Park in February 1882 that Tesla had his breakthrough. While reciting passages from Goethe's Faust to a friend, the complete design of the rotating magnetic field and the AC induction motor appeared fully formed in his mind. He immediately sketched the diagram in the sand with a stick.

The rotating magnetic field — in which multiple alternating currents, offset in phase, create a smoothly rotating field without any physical commutator — was the conceptual foundation of all modern AC machinery.

While on assignment to Strasbourg in 1883, Tesla constructed his first physical induction motor after work hours — turning the vision from Budapest into reality. The model worked perfectly. On returning to Paris, his plan was to collect a promised bonus and find French financial backers, but the bonus never materialised.

Working for Edison

In 1882, Tesla joined Thomas Edison's Continental Edison Company in Paris, where he was put in charge of city lighting installations. His supervisors noted his exceptional engineering ability. In 1884, with little more than a letter of introduction, Tesla emigrated to the United States and began working directly for Edison at his Machine Works in New York City.

"Tesla, you don't understand our American humour."

— Thomas Edison (allegedly), when Tesla asked about the promised $50,000 bonus

Edison and Tesla clashed almost immediately. Edison was committed to direct current (DC); Tesla was convinced that alternating current (AC) was superior for power transmission. According to Tesla's later accounts, Edison promised him $50,000 to improve his DC dynamos. After Tesla delivered the improvements, Edison reportedly dismissed the promise as a joke. Tesla resigned in 1885.

According to Britannica, Tesla arrived in New York in June 1884 "with four cents in his pocket, a few of his own poems, and calculations for a flying machine."

Years of Hardship

After leaving Edison, Tesla formed Tesla Electric Light & Manufacturing in 1886, but his investors forced him out and he lost his patents. For a period in 1886–1887, Tesla was destitute, reduced to digging ditches for $2 a day. He later described this as the hardest period of his life.

The Westinghouse Partnership

In 1887, Tesla built his first brushless AC induction motor and demonstrated it to the American Institute of Electrical Engineers. His 1888 paper describing the polyphase AC system — using AC for generators, motors, and transformers — caught the attention of George Westinghouse, head of Westinghouse Electric.

Westinghouse purchased Tesla's AC patents for approximately $60,000 (equivalent to roughly $2 million today) plus royalties of $2.50 per AC horsepower generated. Tesla joined Westinghouse as a consultant. Together, they championed AC power against Edison's DC system in what became known as the "War of Currents."

Edison launched a negative publicity campaign against AC, staging public electrocutions of animals to demonstrate its supposed danger. He supported the development of the AC-powered electric chair to associate alternating current with death. Despite this, AC's ability to transmit power efficiently over long distances — something DC could not do — made it the clearly superior technology.

The exact circumstances of Tesla's departure from Edison remain disputed. In his autobiography, Tesla stated the manager of the Edison Machine Works offered a $50,000 bonus to redesign "twenty-four different types of standard machines," but it "turned out to be a practical joke." Later versions attribute the offer and the quip to Edison himself. Historians have noted the bonus amount was odd, since the Machine Works did not have that much cash on hand (equivalent to approximately $1.8 million today).

Was Tesla offered the Nobel Prize?

In 1915, reports circulated that Tesla and Edison would share the Nobel Prize in Physics, but the prize went to the father-and-son team of William Henry Bragg and William Lawrence Bragg instead. The details remain unclear, but Tesla reportedly refused the prize, distinguishing between "inspirational discoverers" like himself and "methodical improvers" like Edison. He accepted the Edison Medal from the American Institute of Electrical Engineers in 1917 but made his disinterest noticeable.

The 1893 World's Fair — AC Wins

The decisive moment came at the 1893 World's Columbian Exposition in Chicago. General Electric (Edison's company) bid $554,000 to light the fair using DC. Westinghouse bid $399,000 using Tesla's AC system and won the contract. Tesla personally conducted demonstrations of his AC induction motor, wireless lighting, and other inventions at the fair.

The fairgrounds blazed with 100,000 incandescent lamps powered by AC — a spectacle that convinced the American public that alternating current was both safe and superior. The War of Currents was effectively over.

The Tesla Coil (1891)

In 1891, Tesla invented the Tesla coil, a resonant electrical transformer circuit that produces high-voltage, low-current, high-frequency alternating current. The Tesla coil became fundamental to early radio technology and demonstrated the possibility of wireless power transmission. Tesla used it in dramatic public demonstrations, lighting gas-discharge lamps wirelessly and sending sparks flying through the air.

Pioneering Radio and Remote Control

In 1893, Tesla gave lectures demonstrating the principles of radio communication — two years before Guglielmo Marconi's famous experiments. In 1898, at an electrical exhibition in Madison Square Garden, Tesla demonstrated the first radio-controlled boat, which he called a "teleautomaton." He steered the boat around a pool using a handheld radio transmitter, astonishing the audience. This was the first practical demonstration of remote control — a technology that would eventually lead to guided missiles, drones, and robotics.

Tesla also experimented extensively with X-rays, photographing bones and objects using his own tubes and equipment, contemporary with Wilhelm Röntgen's 1895 discovery.

Colorado Springs (1899–1900)

In 1895, a devastating fire destroyed Tesla's New York laboratory, wiping out years of notes, equipment, and prototypes. He relocated temporarily to Colorado Springs in 1899, where he set up a massive experimental station to study high-voltage, high-frequency electricity and wireless power transmission.

At Colorado Springs, Tesla built the largest Tesla coil ever constructed — 52 feet in diameter — and produced artificial lightning bolts up to 135 feet long. He lit 200 incandescent lamps wirelessly from 25 miles away. He also claimed to have detected signals from outer space, though this claim has never been verified. His Colorado Springs experiments provided crucial data for his later Wardenclyffe project.

Continued Innovation

Despite his financial difficulties, Tesla continued to invent. He developed a bladeless turbine (1913), worked on concepts for vertical takeoff and landing aircraft, and proposed a particle beam weapon he called "Teleforce" — which the press sensationalised as a "death ray."

In 1917, he received the Edison Medal from the American Institute of Electrical Engineers — the highest honour in the electrical profession, and a deep irony given his rivalry with Edison. Edison had died in 1931; Tesla outlived him by over a decade.

In 1943, several months after Tesla's death, the United States Supreme Court upheld Tesla's radio patents, effectively recognising him as the inventor of radio over Marconi.

Poverty and Isolation

From about 1910 onward, Tesla's financial position deteriorated steadily. He moved from hotel to hotel in New York, often unable to pay his bills. His close relationships were few — he never married and was known to avoid physical contact. He developed intense compulsions and phobias: he was obsessed with the number 3, washed his hands compulsively, and could not tolerate touching human hair.

In his later years, Tesla became increasingly reclusive, spending much of his time feeding and caring for pigeons in New York parks and hotel rooms. He reportedly said of one particular white pigeon:

"I loved that pigeon as a man loves a woman, and she loved me."

— Nikola Tesla

Despite his eccentricities, Tesla continued to think about physics and engineering until the end. He claimed in interviews during the 1930s to have devised a theory of energy that would supersede Einstein's, though he never published the details.

The Taxi Accident and Final Decline

In the fall of 1937, at age 81, Tesla was struck by a taxicab while crossing a street near his hotel after midnight. His back was severely wrenched and three ribs were broken. True to his lifelong refusal to consult doctors, Tesla declined medical attention and never fully recovered from his injuries.

What Tesla Made Possible

Every time you plug a device into an electrical outlet, you are using Nikola Tesla's technology. The polyphase alternating current system he designed — including AC generators, transformers, transmission lines, and induction motors — is the foundation of the global electrical grid. Virtually all electricity generated, transmitted, and consumed worldwide uses the principles Tesla patented in the late 1880s.

Beyond AC power, the Tesla coil was essential to the development of radio technology. His work on wireless power transmission anticipated modern wireless charging. His remote-controlled boat was the ancestor of all remotely piloted vehicles. His rotating magnetic field principle is used in every AC motor on Earth — from industrial machinery to electric vehicles.

Tesla vs. Edison — The Vindication

For much of the 20th century, Edison received greater public recognition than Tesla. This began to change in the late 20th and early 21st centuries. The electric car company Tesla, Inc. (founded 2003) was named in his honour, bringing his name to mainstream awareness. Today, Tesla is widely recognised as one of the most important inventors in history and a key figure in the development of modern electrical engineering.

Commemorations

In 1960, the General Conference on Weights and Measures named the SI unit of magnetic flux density the tesla (symbol: T) in his honour. The Nikola Tesla Museum in Belgrade, Serbia, houses his personal effects, documents, and ashes. A statue of Tesla stands on Goat Island overlooking Niagara Falls. The Nikola Tesla Award, given annually by the IEEE, recognises outstanding contributions to electric power generation. The Tesla crater on the Moon and the asteroid 2244 Tesla are named after him. Belgrade's international airport was renamed Nikola Tesla Airport in 2006.