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April 13, 2019

Tesla and the War of the Currents

The flash of a lightning bolt is one of nature’s most powerful phenomena.  It also is a great metaphor for the mind of Nikola Tesla, the brilliant electrical engineer, inventor, and futurist.  His work to improve generator designs and create better components for electrical systems culminated in a battle with one of America’s greatest inventors, Thomas Edison.  Tesla challenged Edison in a conflict now remembered as the War of the Currents.  Today, AC power is the standard for our electric grid; it is cheap, relatively safe, and can be used for everything from heating our homes to making ice.  However, there was a time when the general belief was that AC power was neither safe nor practical.  Some people thought DC power would be better for homes.  In the War of the Currents, the supporters of these two competing concepts clashed.

The war started when two groups with two incomparable electrical systems began competing for municipal contracts to set up power grids to deliver electricity to homes.  Edison directed his company to create a power system that utilized DC power.  The Edison used his marketing experience to push for this system to become the standard for homes and businesses.  His main competitor was financier George Westinghouse.  He employed Tesla and put his ideas into practical use allowing millions of American homes to be wired for AC current.  There could only be one winner.  America was going to be powered by either DC current or AC current, and there was a lot at stake.  It was not just a battle about electricity, but it was also about the future of America and the advances in technology that would build the 21st-century world.1

Nikola Tesla was born to Serbian parents on the night of July 10, 1856 in what is now Croatia.  According to legend, he was born during a powerful thunderstorm, a fortuitous omen as electricity defines the work of Tesla’s life.2  Tesla, a math prodigy, displayed his talents at an early age.  With his eidetic memory, Tesla could visualize objects in his mind with great detail.  He could construct models without having to draw them out.3  These two abilities served him well throughout his life.  Initially, his father wanted him to become a priest but, he relented when the young Tesla fell ill and was possibly on his deathbed.  The elder Tesla promised to allow his son to study math and engineering in school; whether it had an effect or not, the young boy quickly recovered soon after.  After completing his schooling, Tesla went on to pursue a job with a company on the leading edge of electric power.

French Impressionist Oil Painting Paris Street Scene 1880s | Courtesy Cannonbury Antiques

Tesla joined Edison’s world when he took a job at the Continental Edison Company in Paris.  Already displaying an aptitude for electrical engineering, Tesla’s talents were quickly recognized by his superiors, and he immigrated to the United States to take a job in the Edison Machine Works in New York City.4  Working for Edison’s company was a great opportunity for Tesla.  At the time, Edison’s electric company was wiring cities for electric power to light the streets at night.  Tesla’s began by working to improve the DC generators that supplied power to the system; later his supervisors tasked him with improving the arc lighting system they were installing.  The arc lights were powered by AC current but could only be used outdoors for safety reasons.  Tesla completed the work asked of him by manager Charles Batchelor, but Batchelor refused to pay Tesla promised bonuses for accomplishing the work.  This resulted in Tesla’s departure from the Edison Machine Works, but he did not leave empty handed.5

Tesla’s experience at the Edison Machine Works was just the beginning of his troubles.  His work at the company included designing a better arc lighting system, which the company declined to file a patent on.  After he left, Tesla was able to claim the patent rights and put the system into production himself.  This was a fortunate break for Tesla as he would be able to use the patents to attract investors. This lead to the formation of the Tesla Electric Light & Manufacturing Company. However, this venture did not go as well as Tesla had hoped.  Tesla signed over his patent rights in exchange for stock in the company, a seemingly good deal at the time.  Powered by his new technology, the company should have taken off, but this was not the case.  Investors backed away from the dangerous arc lights and no one was interested in the AC motors Tesla had developed.  The company folded and Tesla had nothing to show for it.  He was left digging ditches for two dollars a day.  Tesla was at the lowest point in his life.6

George Westinghouse | Courtesy of Pixabay

This set back was only temporary, better days were on the horizon for Tesla.  Salvation arrived when he was contacted by investors looking to profit from newly patented technologies.  The first two men that helped Tesla get back on the right track were Alfred Brown and Charles Peck.  They had experience taking people’s inventions and setting up companies to profit from them.  They worked with Tesla and gave him a chance to develop and perfect his AC motors.  Tesla’s work captured the attention of George Westinghouse who was working on an AC power system that was competing with Edison’s DC system.  Westinghouse looked at Edison’s DC system and quickly realized it had a flaw.  Even though Edison’s system was safer because of the low voltage, the process of transmitting the power over long distances was not practical.  The DC system worked well in crowded urban centers like New York or Philadelphia, but bringing power to rural communities would present a challenge with Edison’s system.  Westinghouse capitalized on this shortcoming by promoting an AC power system to bring electricity to smaller communities further away from the power plants producing the electricity.  Edison was not going to back down in the face of this new competition. The War of the Currents had begun.7

Thomas Edison c. 1922 | Courtesy of Wikipedia

The battle for which electric system would power America would last just a few short years.  However, the influence it exerted changed the future of technology in America.  In 1888, an electric line worker in New York City died while doing a repair on the AC lines that were powering the arc light system in the city. Edison jumped on this opportunity.  He fanned the anti-AC furor that grew out of the worker’s death.  Edison even secretly hired a man named Harold P. Brown to travel to cities and put on public demonstrations where animals were killed by electrocuting them with AC current to show the public how dangerous it was.  The most memorable contribution to come from Edison during this campaign was the invention of a new method of execution for condemned prisoners, the electric chair.  Edison was personally against the death penalty, however this did not stop him from secretly financing the development of  the electric chair.  Edison hoped that using AC generators would further influence public opinion against AC current.  The first executions did not go well resulting in a lack of the negative publicity that Edison desired.8

World’s Columbian Exposition Administration Building| Courtesy of Wikimedia

The War of the Currents would end by 1893.  In the closing years of the nineteenth century, plans were being made for a huge celebration of the past and a glorious look at the future.   The city of Chicago wanted to use electricity to illuminate the World’s Fair it was hosting.  The World’s Columbian Exhibition was to be a celebration of the 400th anniversary of Christopher Columbus’ landing in North America.  However, in the tradition of World’s Fairs the exhibition also displayed new technologies that were going to be introduced to the public in the near future. One of the new technologies to be showcased at the Fair was electric lighting.  Westinghouse won the contract to rig the lighting for the fair, his bid being substantially lower than Edison’s bid.  The DC power system was just too costly to implement, even for something as small as a fair.  The publicity for AC power would be huge.  For once, the public could see the wonders of the AC system that Tesla helped to develop.  Even though Edison’s DC system was safer, it could not compete with the cost-effectiveness of the AC system , especially in rural communities where the power had to be transmitted over longer distances.  Once Westinghouse started winning numerous bids because of the lower cost involved in producing and transporting AC power Edison could no longer compete, and Westinghouse and the AC system would become the power of the future for the world.  Tesla’s final victory would come when Edison was forced to merge with a different competitor and formed the General Electric Company.9


  1. Michael Parks, “Tesla, Edison, and the War of Currents,” Tech Directions #78, no. 2 (October 1, 2018): 12.
  2. Richard Munson, Tesla: Inventor of the Modern (Norton & Company, Incorporated, W.W., 2018), 10.
  3. Christopher Cooper and Marc J. Seifer, The Truth about Tesla: The Myth of the Lone Genius in the History of Innovation (New York: Race Point Publishing, 2018), 23-24.
  4. John J. O’Neill, Prodigal Genius: The Life of Nikola Tesla (Ives Washburn 1944), 57-60.
  5. W. Bernard Carlson, Tesla: Inventor of the Electrical Age (Princeton: Princeton University Press, 2013), 62-70.
  6. Christopher Cooper and Marc J. Seifer, The Truth about Tesla: The Myth of the Lone Genius in the History of Innovation (New York: Race Point Publishing, 2018), 35-36.
  7. W. Bernard Carlson, Tesla: Inventor of the Electrical Age (Princeton: Princeton University Press, 2013), 72-76.
  8. Mark Essig, Edison and the Electric Chair: A Story of Light and Death (New York: Bloomsbury Publishing USA 2009), 137-140.
  9. Richard Gunderman, “The Extraordinary Life of Nikola Tesla,”, January 05, 2018.

Tags from the story

AC power

Edison Machine Works


General Electric

Nikola Tesla

Thomas Edison

War of the Currents

S. Michael Sleeter

I am a high school history teacher and an aspiring public historian. I strive to bring new voices to tell the stories of the past as I challenge my student to analyze and think critically about the events of the past.

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Recent Comments

Arturo Canchola

The Edison vs Tesla debate is one that is well-heard of inside the scientific community, especially aspiring physicists and engineers. Tesla’s mid is regarded as on of the most forward-thinking and intelligent in physics, and for good reason — the idea for the A/C system was truly groundbreaking. This article does a great job of discussing the feud between these two and the lasting impact left on society from their inventions.



7:22 pm

Mitchell Yocham

When I was growing up I had no idea that Edison and Tesla were in a constant war, but despite thinking that Edison’s electricity was better, it really wasn’t and Tesla one the war. Even though he had to resort to digging ditches, his power ended up winning in the after math.



7:22 pm

Isabella Torres

I had no idea that Tesla had eidetic memory! I have always wanted to be able to visualize things as easily as he could in his mind. I was never aware that Tesla and Edison ever competed for which power concept was better for houses. I also never knew that they collaborated at all. Although Edison’s DC power type was considered much safer at the time, Tesla’s AC power type was ultimately a lot more cost-effective and worked a lot better for rural areas. I enjoyed reading this article and learning about a topic that I was not previously very familiar with.



7:22 pm

Shea Slusser

I have heard of this conflict in my high school physics class, and its honestly so disappointing for a discovery so great to be taken away from its discoverer because it was stolen. The positive implements this creation provided for the world is without a doubt one of the greatest technological advancements. The car company “Tesla” gave great honor to Telsa himself, and I think that was a tremendous honor for him.



7:22 pm

Aiden Dingle

I knew that Edison and Tesla had competition and were rivals, but this is the first time that I’m reading about this conflict. It’s kind of shocking how far Edison went just to come out on top, even though his system lost in the end. This article makes me want to dig further into the rivalry to see just how twisted this history is between the two because I always thought that it was just a friendly rivalry.



7:22 pm

Aaron Sandoval

This article was well written and had a nice pace to it. I enjoyed reading the details of Tesla’s life and the many battles between him and Edison, I would have liked to see an inclusion of the fight for the Niagara Falls contract. But other than that, the development from when Tesla was a child, to working for Edison, to his lowest point working in ditches, to the many battles between AC and DC currents. It would have also been nice if there was a little more detail on how Edison used the death penalty and the fear of AC currents to weaken Tesla.



7:22 pm

Arsema Abera

I have never heard that such conflict existed between two aspiring physicists. I just knew Tesla is the name of the SI unit of the magnetic field and an electric car named after him, interesting. This article was well written and really informative thanks to this article I now know who was the mastermind behind the A.C idea.



7:22 pm

Bailey Godwin

I never knew that Edison and Tesla were such rivals and had conflicts. I did not know Edison financed the electric chair either. That is very strange and interesting to me, especially because he did not even support the death penalty. Edison stooped to such a low level to come out on top and he did not even end up “winning”



7:22 pm

Eric Hernandez

This article was very interesting. It really highlighted an important piece of history in the electrical world. To me this is very interesting because it makes the simplicity of electricity interesting. It was interesting to see the competition in the electric world and how it has innovated our way of life. Without competition, our world wouldn’t be able to continue to improve and expand.



7:22 pm

Edgardo Llosa

This article is really interesting because it shows one of the biggest ideas that are nowadays being used more and more by modern companies such as Tesla itself and other car companies. This shows the story behind all of these innovative ideas that come from far behind and is used as inspiration for new technology and it all comes from this rivalry that made these two people Edison and Tesla push each other in a way.



7:22 pm

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