Wiktor Wise
The history of electricity is a complex one, with many scientists and researchers contributing to its discovery and development over centuries. While Thomas Edison, Nikola Tesla, and Benjamin Franklin are often credited with significant advancements in the field of electricity, the understanding and application of this fundamental phenomenon have evolved through the efforts of numerous individuals. From early observations by Thales of Miletus and the ancient Egyptians to the groundbreaking experiments of Franklin and the innovations of Tesla, the story of electricity is a testament to human curiosity and ingenuity.
| Characteristics | Values |
|---|---|
| Discovery of electricity | It is widely believed that electricity was discovered and not invented as it is a set of physical phenomena. |
| First discovery | The first observable instance of electricity was noted in Ancient Egypt, where people observed the shock-like effect of electric fish on human skin. |
| Notable contributors | Benjamin Franklin, Thomas Edison, Nikola Tesla, Charles Steinmetz, Alexander Graham Bell, Alessandro Volta, Michael Faraday, James Clerk Maxwell, William Gilbert, Otto von Guericke, Robert Boyle, Stephen Gray, C.F. du Fay, and many others. |
| Notable inventions and discoveries | Franklin's kite experiment and lightning rod, Edison's incandescent light bulb, Tesla's alternating current (AC) system, Steinmetz's work on electric fields, Bell's telephone, Volta's voltaic pile, Faraday's electric motor, Maxwell's work on electromagnetic fields, and more. |
| Historical development | The study of electrical phenomena dates back to antiquity, with notable contributions from ancient Greek philosophers like Thales of Miletus. However, the development of the theory of electromagnetism in the 19th century marked a significant turning point, leading to industrial and residential applications of electricity. |
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What You'll Learn
Ancient Egyptians and electric fish
Electricity is not an invention, but a discovery. The first data collected on static electricity was analysed by Girolamo Cardano in the 16th century. However, the ancient Egyptians' use of electric fish is evidence of an even earlier, albeit informal, understanding of electricity.
The electric catfish of the Nile was well known to the ancient Egyptians, who used the electric shock from smaller fish to treat arthritic pain. They would avoid larger fish, which can generate an electric shock from 300 to 400 volts. The electric catfish was depicted in Egyptian mural paintings and on a slate palette belonging to the predynastic Egyptian ruler Narmer around 3100 BC. The Arab physician Abd al-Latif al-Baghdadi described the fish in the 12th century by the name of الرعد el raad, meaning "thunder".
The torpedo ray and the electric eel were investigated by scientists in the 18th century, including Hugh Williamson and John Walsh. Williamson presented a paper on the electric eel to the Royal Society in 1775, detailing his experiments with the fish. In 1838, Michael Faraday extensively tested the electrical properties of an electric eel, noting that the strongest shock was obtained when both hands or a pair of copper paddles were placed in the water by the head and tail of the fish.
In addition to the ancient Egyptians, the ancient Greeks also had some knowledge of electric fish. Aristotle wrote that the torpedo fish stunned its prey and could cause numbness in humans. However, they did not always distinguish between the marine torpedo ray and the freshwater electric catfish.
The ancient Egyptians' use of electric fish for pain relief demonstrates a rudimentary understanding of electricity that predates the modern scientific discovery and research of electricity by centuries.
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Thales of Miletus and static electricity
Electricity was not invented but rather discovered, as it is a set of physical phenomena. The use of electricity as we know it today is the result of much research and years of development.
Thales of Miletus, a Presocratic Greek philosopher, is often credited with discovering electrostatic charging and carrying out the first experiments or systematic observations of this phenomenon. He noted that amber attracts lightweight materials such as feathers when rubbed, making this the first historical reference to static electricity. He also experimented with lodestone, or magnetite, observing that it could attract iron.
Thales is likely to have commented on electrostatics in connection with his philosophical idea that even inanimate objects have a soul or a piece of one. However, there is no basis to believe that he discovered electrostatic charging or carried out experiments or systematic observations on it.
The first data collected on static electricity was analysed by Girolamo Cardano, who included electric and magnetic forces in his work 'De Subtilitate' as early as 1550. In the 18th century, the first capacitor was developed by scientists Ewald Georg Von Kleist and Pieter Van Musschenbroek, who created the Leyden Jar.
Benjamin Franklin built on this research by flying a kite during a thunderstorm in 1752. He attached a key to the kite string, and electricity coursed through the key, causing a shock of light. This proved that static electricity and illumination were the same, and therefore that lightning was a form of electricity. Franklin continued his research, making discoveries about positive and negative charges.
The invention of the incandescent lightbulb is often attributed to Thomas Edison in 1879, although he built on the work of earlier researchers such as Alessandro Volta.
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William Gilbert and the term 'electricity'
William Gilbert, an English physician, physicist, and natural philosopher, is known for his work in the field of electromagnetism. He was born in Colchester, Essex, England, in 1544 and received his education at St. John's College, Cambridge University, where he obtained bachelor's, master's, and doctoral degrees.
Gilbert's most notable contribution to the field of electricity was his six-volume treatise, "De Magnete, Magneticisque Corporibus, et de Magno Magnete Tellure" ("On the Magnet, Magnetic Bodies, and the Great Magnet of the Earth"). Published in 1600, this work compiled all the knowledge of magnetism and electricity known at the time. It included descriptions of Gilbert's experiments, such as his development of the versorium, a metal needle that could pivot freely in response to magnetic and electric fields, and his conclusions, as well as data obtained by others.
In "De Magnete," Gilbert established much of the basic terminology still used in electromagnetics, including the term "electricity." He was the first to use the term to refer to the attractive properties of amber, or "elektron" in Greek. Gilbert also introduced other terms such as "electric attraction," "electric force," and "magnetic pole." Additionally, he argued that electricity and magnetism were distinct phenomena, although later scientists would demonstrate that they are aspects of a single force: electromagnetism.
Gilbert's work laid the foundation for further research and experimentation in electricity and magnetism. He is remembered for his significant contributions to the field, and a unit of magnetomotive force, also known as magnetic potential, was named the Gilbert in his honour.
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Benjamin Franklin and the lightning rod
While there is no single inventor of electricity, as it was a discovery and not an invention, Benjamin Franklin is credited with grounding the basics of electricity and its behaviour. He also contributed to the development of lightning rods, which are used to protect buildings and people from lightning strikes.
Franklin was fascinated by storms and loved to study them. He first encountered other scientists' electrical experiments in Boston, Massachusetts, in 1746. By 1750, Franklin wanted to prove that lightning was a form of electricity and began thinking about ways to protect people and structures from lightning strikes. This led to his idea for the lightning rod.
Franklin described his concept as an iron rod about 8 to 10 feet long, sharpened to a point at the end. He theorised that the electrical fire would be drawn out of the cloud before it could strike, protecting buildings and ships from lightning damage. He wrote:
> "May not the knowledge of this power of points be of use to mankind, in preserving houses, churches, ships, etc., from the stroke of lightning, by directing us to fix, on the highest parts of those edifices, upright rods of iron made sharp as a needle... Would not these pointed rods probably draw the electrical fire silently out of a cloud before it came nigh enough to strike, and thereby secure us from that most sudden and terrible mischief!"
Franklin's English colleagues favoured blunt-tipped lightning rods, reasoning that sharp ones might attract lightning and increase the risk of strikes. However, Franklin's design became widely adopted across Europe and North America, significantly advancing the understanding and application of lightning protection systems.
In June 1752, Franklin conducted his famous kite experiment in Philadelphia. He attached a metal key to a kite and flew it during a thunderstorm. The key received an electrical charge from the air, confirming that lightning was indeed a form of electricity.
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Nikola Tesla and alternating current (AC)
While electricity was not invented but rather discovered, Serbian-American engineer, inventor, and futurist Nikola Tesla played a key role in the development of modern electricity. Tesla is particularly known for his contributions to the design of the alternating current (AC) electricity supply system.
In a series of history-making patents, Tesla demonstrated a polyphase alternating-current system, consisting of a generator, transformers, transmission layout, and motor and lights. This system, which provided the basic elements for electrical production and utilization, remains largely unchanged today.
In 1888, George Westinghouse, head of the Westinghouse Electric Company, bought the patent rights to Tesla's system of dynamos, transformers, and motors. Westinghouse used Tesla's alternating current system to light the World's Columbian Exposition of 1893 in Chicago. The same year, the Niagara Falls Power Company decided to award Westinghouse—who had licensed Tesla's polyphase AC induction motor patent—a contract to generate power from Niagara Falls. On November 16, 1896, Buffalo was lit up by the alternating current from Niagara Falls, demonstrating the superiority of alternating current over direct current.
Tesla's alternating current system was based on the insight that alternating current, which reverses direction a certain number of times per second, can be converted to different voltages relatively easily using a transformer. This was a significant improvement over direct current, which is not easily converted to higher or lower voltages. Despite the advantages of alternating current, Thomas Edison, who had developed direct current and was earning royalties from his direct current patents, campaigned to discredit it, spreading misinformation that it was more dangerous.
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Frequently asked questions
No one invented electricity, it was a discovery. The first observable instance of electricity goes back to Ancient Egypt, where some noted the shock-like effect of electric fish on human skin.
Many people contributed to the discovery of electricity. The Greek philosopher, Thales of Miletus, is credited with discovering the effects of magnetism and static electricity around 600 BC. In 1600, English scientist William Gilbert coined the term 'electricus' and was the first person to use the terms 'electric force', 'magnetic pole', and 'electric attraction'. In 1752, American polymath Benjamin Franklin conducted his famous kite experiment, which showed that lightning consists of electricity.
While Thomas Edison is often credited with inventing the lightbulb, he in fact modified it after buying the patent from Canadian inventors Henry Woodward and Mathew Evans.
