Molly Ayala
Benjamin Franklin's kite experiment is one of the most famous and mythologized episodes in the history of science. On a stormy June afternoon in 1752, Franklin flew a kite with a key attached to its string during a thunderstorm to demonstrate the connection between lightning and electricity. Historians are unsure of the exact date of the experiment, and some even question whether it took place at all. Contrary to popular belief, Franklin did not discover electricity, as electrical forces had been recognized for over a thousand years. Instead, his experiment demonstrated that lightning and electricity were the result of the same phenomenon. Franklin's work in this field led to several innovations, including coining terms like battery, conductor, and electrician, as well as the invention of the lightning rod.
| Characteristics | Values |
|---|---|
| Date of the kite experiment | June 10, 1752 (disputed) |
| Purpose of the kite experiment | To demonstrate the connection between lightning and electricity |
| Outcome of the kite experiment | Successful; Franklin felt an electric spark, proving the electric nature of lightning |
| Location of the kite experiment | Philadelphia, possibly in a field or in a shed |
| Materials used | Kite, hemp string, silk string, house key, Leyden jar, sharp wire |
| Assistants | Franklin's son, William |
| Related inventions | Lightning rod |
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What You'll Learn
Benjamin Franklin's kite experiment
Franklin's experiment aimed to investigate the nature of lightning and electricity, which were not yet fully understood at the time. He wanted to demonstrate the electrical nature of lightning and prove that lightning and electricity were the result of the same phenomenon.
The kite was constructed using a large silk handkerchief, with a hemp string and a silk string attached. The hemp string, being wet from the rain, would conduct an electrical charge quickly, while the silk string, held by Franklin in the doorway of a shed, remained dry and would not conduct electricity. A metal key was attached to the hemp string, and a Leyden jar, an early form of capacitor that could store an electrical charge, was connected to the hemp and silk strings.
As the kite flew near thunderclouds, it collected static electricity from the air and conducted it down the wet kite string to the ground. Franklin observed that the loose threads of the hemp string stood erect, indicating the presence of an electric charge. He then moved his finger near the key and observed an electric spark, confirming the electrical nature of lightning.
Franklin's kite experiment, along with further experiments on the ground, successfully demonstrated the connection between lightning and electricity. However, contrary to popular belief, the kite was not directly struck by lightning. Franklin's experiment showcased his ingenuity and curiosity, contributing to our understanding of electricity and its relationship with lightning.
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The experiment's purpose
The experiments conducted by Benjamin Franklin in the mid-1740s aimed to investigate the nature of lightning and electricity, which were not yet fully understood. Franklin's experiments focused on demonstrating the connection between lightning and electricity.
Franklin's kite experiment, which he conducted with the assistance of his son, William, is one of his most famous endeavours. 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 the wet kite string to the ground.
Franklin's kite was made with a large silk handkerchief, a hemp string, and a silk string. He also had a house key, a Leyden jar (a device that could store an electrical charge), and a sharp length of wire. The hemp string, wetted by the rain, would conduct an electrical charge quickly, while the silk string, kept dry, would not. The key, attached to the hemp string, was connected to the Leyden jar, with a silk string attached to that.
As Franklin moved his hand near the key, he observed an electric spark, proving the electric nature of lightning. This experiment did not involve Franklin being struck by lightning, as is commonly believed. Instead, he noticed that the loose threads of the kite string were repelling one another, indicating that the Leyden jar was being charged.
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The experiment's execution
The execution of Benjamin Franklin's kite experiment is steeped in myth and has been the subject of much historical debate. The experiment is said to have taken place in Philadelphia, sometime in June 1752, possibly on the 10th.
Franklin and his son, William, took advantage of the approaching thunderstorm to conduct the experiment. They chose a location that would provide shelter from the rain, likely a shed or lean-to, as most depictions of Franklin standing in an open field are inaccurate. Franklin's goal was not to have the kite struck by lightning, but rather to demonstrate the connection between lightning and electricity.
Franklin's kite was made with a large silk handkerchief, a hemp string, and a silk string. He also had a house key, a Leyden jar (a device for storing electrical charges), and a sharp wire. The hemp string was allowed to get wet in the rain, while the silk string was kept dry. The metal key was attached to the hemp string, with the Leyden jar and silk string connected to it. As the kite flew, the hemp, wet from the rain, conducted an electrical charge, while the silk string remained non-conductive.
Franklin noticed that the loose threads of the hemp string were standing erect, indicating the presence of an electric charge. He then moved his finger near the key, and as the negative charges in the metal attracted to the positive charges in his hand, he felt a spark, thus proving the electric nature of lightning.
It is important to note that Franklin did not discover electricity during this experiment, nor did the kite get struck by lightning. However, his experiment successfully demonstrated the connection between lightning and electricity, dispelling the myths surrounding it.
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The experiment's outcome
Benjamin Franklin's kite experiment is one of his most famous—and mythologized—experiments. The experiment was first proposed in 1752 to investigate the nature of lightning and electricity, which were not yet fully understood. Franklin's goal was not to get struck by lightning but to demonstrate the connection between lightning and electricity.
Franklin's experiment involved flying a kite with a key attached to its string during a thunderstorm. The hemp string, wetted by the rain, would conduct an electrical charge quickly, while the silk string, which Franklin held and kept dry, would not. As a result, he was able to remain on the ground while his son, William, flew the kite from the cover of a nearby shed.
Franklin noticed that the loose threads of the kite string were repelling one another, indicating that the Leyden jar, a device that could store an electrical charge, was being charged. He then moved his hand near the key and observed an electric spark, proving the electric nature of lightning.
Franklin's ideas circulated in Europe, and his experiment inspired similar attempts by scientists in France. However, one such attempt to replicate the experiment killed Georg Wilhelm Richmann in Saint Petersburg in 1753. Franklin's work in the field of electricity also led to his invention of the lightning rod, used to protect buildings and ships.
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Franklin's other contributions
Benjamin Franklin's work with electricity is well-known, but he also made significant contributions in various other fields. He was an American writer, scientist, inventor, statesman, diplomat, printer, publisher, and political philosopher. He was one of the leading intellectuals of his time and played a crucial role in the American Enlightenment. He was also the only Founding Father to sign all the documents of the American Revolution.
Franklin's experiments with electricity were not his only scientific endeavours. He also conducted experiments to observe lunar eclipses, and he had a particular interest in silk production and agriculture. He believed that the colonies could become self-sufficient in silk production, reducing their dependence on imports from Asia. In addition, he gathered information about crop types that would thrive in the colonies' unique climates and conditions.
Franklin was also an inventor, accredited with the invention of the lightning conductor, the Franklin Stove, bifocal spectacles, and oceanography, among others. He was a constant inventor, always coming up with new ideas and creations. He also coined the terms "battery," "positive charge," and "negative charge," and discovered new methods for generating, storing, and deploying electricity.
Franklin's influence extended beyond science and technology. He was a prolific writer, publishing "Poor Richard's Almanack" under the pseudonym Richard Saunders. His writing style was characterised by wit and clarity, and he used it to advocate for various causes, including the abolition of slavery, though he himself owned enslaved people. Franklin's writing and ideas had a significant impact on the birth of Rationalism, and he is considered one of the most important experimental natural philosophers of his era.
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Frequently asked questions
Benjamin Franklin didn't actually discover electricity, but his famous kite experiment in 1752 helped demonstrate the connection between lightning and electricity.
Franklin flew a kite during a thunderstorm to collect ambient electrical charge in a Leyden jar (an early form of capacitor).
Franklin noticed loose threads of the kite string were repelling one another, indicating that the Leyden jar was being charged. He then moved his hand near a metal key attached to the kite string and observed an electric spark, confirming the electric nature of lightning.
Franklin's experiment provided important insights into the relationship between lightning and electricity, contributing to the advancement of understanding in the field of electricity.
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