Wiktor Wise
The discovery of the electrical nature of matter has been a process spanning millennia, with contributions from scientists across the world. The ancient Greeks, around 2600 years ago, were the first to discover the notion of electrical charge, with the philosopher Thales of Miletus observing that rubbing amber with fur caused it to attract small objects. However, he incorrectly attributed this phenomenon to magnetism. In 1600, English scientist William Gilbert distinguished the lodestone effect from static electricity produced by rubbing amber, coining the term electricus to describe the property of attraction. While Benjamin Franklin is often credited with discovering electricity through his famous kite experiment, he was not the first to demonstrate that lightning is a form of electricity.
| Characteristics | Values |
|---|---|
| Discovery of the electrical nature of matter | Electricity as a form of energy cannot be invented. It has been studied by several scientists over the centuries. |
| First discovery | The Greeks were the first to discover the notion of electrical charge over 2600 years ago. |
| First discoverer | Around 600 BCE, the Greek philosopher, Thales of Miletus, observed that rubbing certain materials together, such as amber and fur, would cause them to attract nearby objects. |
| Other discoverers | Benjamin Franklin, William Gilbert, Thomas Browne, Luigi Galvani, Albert Einstein, G. Johnstone Stoney, J.J. Thomson, Wilhelm Wien, Max Abraham, Hermann Minkowski, Gustav Mie, Hendrik Lorentz, Pieter Zeeman, Clifford, Harry Jones |
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What You'll Learn
The Greeks' discovery of static electricity
The discovery of electricity was a culmination of centuries of observation, experimentation, and human ingenuity. It was not the achievement of a single person or event. The ancient Greeks are credited with discovering static electricity around 600 BCE.
Thales of Miletus, a pre-Socratic Greek philosopher, is often regarded as the earliest recorded discoverer of electricity. He observed that when amber (elektron in Greek, from which the word "electricity" is derived) was rubbed with another substance, like fur, it attracted small objects such as feathers or bits of straw. This phenomenon is now known as static electricity. Thales incorrectly believed that the attraction was due to a magnetic effect, but later science would prove a link between magnetism and electricity.
The Greeks also knew about magnets and their attractive power being concentrated at two "poles". They understood that two different types of poles existed: the north-seeking pole (N or "north") and the south-seeking pole (S or "south"). They noted that two poles of different types attracted each other, while poles of the same kind repelled each other. This early understanding of magnetism contributed to the foundation of knowledge about electricity.
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Benjamin Franklin's kite experiment
While Benjamin Franklin did not discover electricity, he is known for his famous kite experiment, which demonstrated the connection between lightning and electricity.
Franklin's kite experiment was first proposed in 1752. The experiment involved flying a kite with a pointed conductive wire attached to its apex near thunderclouds. The purpose was to collect static electricity from the air and conduct it down a wet kite string to the ground. The experiment was designed to investigate the nature of lightning and electricity, which were not yet fully understood at the time.
Franklin constructed a simple kite and attached a wire to the top to act as a lightning rod. He then attached a hemp string to the kite, which would serve as a conductor when wet. To this hemp string, he attached a silk string, which would remain dry and act as an insulator. Finally, he attached a metal key to the hemp string, which was connected to a Leyden jar, an early form of capacitor that could store an electrical charge.
With the help of his son, Franklin flew the kite during a thunderstorm. The kite picked up the ambient electrical charge from the storm, and the key began to emit sparks, demonstrating that lightning was indeed electrical in nature.
Franklin's experiment, along with similar experiments conducted by other scientists, helped prove that lightning was a form of electricity. This knowledge paved the way for further experimentation and the development of lightning rods to protect tall buildings from lightning damage.
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William Gilbert's study of electricity and magnetism
In 1600, the English scientist William Gilbert published De Magnete, a seminal text on magnetism and electricity. In this work, Gilbert made a careful study of electricity and magnetism, distinguishing the lodestone effect from static electricity produced by rubbing amber. He coined the Neo-Latin word "electricus" ("of amber" or "like amber", from the Greek word for amber, "elektron") to refer to the property of attracting small objects after being rubbed.
Gilbert's work included descriptions of his own experiments and the conclusions he drew from them, as well as data obtained by others. He developed a versorium, an instrument consisting of a metal needle suspended so that it could pivot freely in response to a magnetic or electric field, and a round lodestone called a terrella. Through his experiments, Gilbert concluded that the Earth acts as a bar magnet, with the needle of a compass pointing north-south and dipping downward due to the Earth's magnetic nature.
Gilbert established much of the basic terminology still used in electromagnetics, including "electricity", "electric attraction", "electric force", and "magnetic pole". He is often considered the father of electrical studies and was appointed physician to Queen Elizabeth I in 1601.
In addition to his work on electricity and magnetism, Gilbert also held modern views on the structure of the universe. In his unpublished writings, he agreed with Copernicus that the Earth rotates on its axis and that the planets were held in their orbits by a form of magnetism.
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Ørsted's discovery of a magnetic field around a wire carrying an electric current
On April 21, 1820, Danish physicist Hans Christian Ørsted discovered a magnetic field around a wire carrying an electric current. Ørsted's discovery paved the way for a new branch of science—electromagnetism.
Ørsted's discovery was a result of an experiment he conducted while lecturing on the possibility of electricity and magnetism being related. During the experiment, Ørsted passed an electric current through a metal wire suspended above a magnetic compass, causing the compass needle to move in response to the current. This observation demonstrated the magnetic effect of an electric current and sparked further research into the relationship between electricity and magnetism.
Ørsted's finding was significant as it provided the first empirical evidence that electricity and magnetism were linked. Prior to his discovery, these two phenomena were considered entirely separate. Ørsted's work laid the foundation for the development of electromagnetism and the exploration of electromagnetic phenomena.
Following Ørsted's discovery, scientists such as André-Marie Ampère and James Clerk Maxwell conducted extensive theoretical and experimental investigations. Ampère studied the magnetic force between two current-carrying wires, leading to the discovery of Ampère's force law. Maxwell, a Scottish mathematical physicist, generalized these results and others into a single mathematical law, now known as Maxwell's circuital law or the Ampère–Maxwell law.
The law, published in 1855, relates magnetic fields to the electric currents that produce them and can be used to determine the magnetic field associated with a given current or the current associated with a given magnetic field. This work by Maxwell, along with Ørsted's discovery, played a crucial role in the development of classical electromagnetism and our understanding of the relationship between electricity and magnetism.
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Luigi Galvani's discovery of bioelectromagnetics
Luigi Galvani, born on September 9, 1737, in Bologna, Italy, was a physician, physicist, biologist, and philosopher. He is renowned for his discovery of bioelectromagnetics, also known as animal electricity, and is recognized as a pioneer in the field of bioelectromagnetics.
Galvani's interest in the field of "medical electricity" or "animal electricity" emerged in the mid-18th century, following the discovery of electricity's effects on the human body. In 1780, Galvani made a groundbreaking discovery that laid the foundation for his recognition in the field of bioelectromagnetics. He observed that the muscles of dead frogs' legs twitched when struck by an electrical spark, indicating the presence of electricity in animal tissue. This discovery marked an early study of bioelectricity and sparked further exploration into the electrical patterns and signals within tissues such as nerves and muscles.
Galvani's work in animal electricity was met with both support and skepticism. Alessandro Volta, a professor of experimental physics at the University of Pavia, initially embraced Galvani's findings but later questioned the concept of "animal electric fluid." Despite their differing views, Volta coined the term "Galvanism" to describe a direct current of electricity produced by chemical action. Galvani actively investigated animal electricity until his death, and his work left a lasting impact on scientific understanding and popular culture.
Galvani's research inspired Mary Shelley's classic novel, "Frankenstein", and his name is immortalized in everyday language with the verb "galvanize." Additionally, numerous specialized terms in various fields bear his name, including Galvani potential, galvanic anode, galvanic bath, and galvanic cell, among others. Galvani's contributions to the understanding of bioelectromagnetics and his influence on literature and language showcase his enduring legacy in the world of science and beyond.
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Frequently asked questions
The electrical nature of matter has been studied by many scientists across the centuries. The Greeks were the first to discover the notion of electrical charge over 2,600 years ago. Around 600 BCE, the Greek philosopher Thales of Miletus observed that rubbing certain materials together, such as amber and fur, would cause them to attract nearby objects.
Some believe Benjamin Franklin was the first to discover electricity through his famous kite and key experiment, which showed that lightning is a form of electricity. However, electricity as a physical phenomenon had been identified thousands of years before Franklin. Other notable contributors include William Gilbert, who studied electricity and magnetism and coined the term "electricus", Thomas Browne, who used the word "electricity" in a book on physics, and Johnstone Stoney, who introduced the term "electron" in 1894.
Some other important discoveries include Ørsted's finding in 1821 that a magnetic field existed around all sides of a wire carrying an electric current, Luigi Galvani's discovery of bioelectromagnetics in 1791, and the identification of plasma by Sir William Crookes in 1879.
