Beatrice Lang
Many scientists have contributed to our understanding of electricity over the centuries. The ancient Greek philosopher Thales of Miletus is credited with discovering the effects of magnetism and static electricity. In 1600, William Gilbert, an English scientist, wrote 'De Magnete', in which he coined the term 'electricus' to refer to the property of attracting small objects after being rubbed. In 1752, Benjamin Franklin is credited with discovering electricity through his famous kite experiment, which proved that lightning consists of electricity. Other pioneers include Nikola Tesla, Thomas Edison, Michael Faraday, Alessandro Volta, and Hertha Ayrton, who all made significant contributions to the field of electricity and its practical applications.
| Characteristics | Values |
|---|---|
| Name | Michael Faraday |
| Birthplace | Milan, Ohio |
| Nationality | British |
| Fields | Scientist, physicist, chemist, inventor, businessman |
| Key Contributions | Electric motor, electromagnetic induction, electric generators and transformers |
| Other Notable Figures | Benjamin Franklin, Thomas Edison, Nikola Tesla, Hertha Ayrton, Charles Fritts |
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What You'll Learn
- Michael Faraday: formulated laws of electromagnetic induction
- Benjamin Franklin: proved lightning was electricity with his kite experiment
- Thomas Edison: developed the first practical electric lightbulb
- Nikola Tesla: pioneered alternating current (AC) power transmission
- William Gilbert: coined the term 'electricus'
Michael Faraday: formulated laws of electromagnetic induction
Michael Faraday, an English scientist, formulated the laws of electromagnetic induction and made groundbreaking discoveries in electromagnetism. Faraday's work laid the foundation for the development of electric generators and transformers.
Faraday's law of electromagnetic induction, also known as Faraday's law, is the basic law of electromagnetism that helps predict how a magnetic field would interact with an electric circuit to produce an electromotive force (EMF). This phenomenon is known as electromagnetic induction and is the fundamental operating principle of transformers, inductors, and many types of electric motors, generators, and solenoids.
Faraday's law states that a changing magnetic field can induce an electric current in a circuit. This is expressed as the Maxwell-Faraday equation, which states that a time-varying magnetic field is always accompanied by a circulating electric field. This law applies to the fields themselves and does not require a physical circuit.
Faraday's first law of electromagnetic induction states that whenever a conductor is placed in a varying magnetic field, an electromotive force is induced. His second law of electromagnetic induction states that the induced EMF in a coil is equal to the rate of change of flux linkage.
Faraday performed three main experiments to discover the phenomenon of electromagnetic induction. He observed transient currents when a bar magnet was rapidly moved into or out of a coil of wire. He also built a device, now known as Faraday's disk or homopolar generator, that produced a steady (DC) current by rotating a copper disk in the presence of a stationary magnet, using a sliding electrical contact.
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Benjamin Franklin: proved lightning was electricity with his kite experiment
While Benjamin Franklin is often credited with discovering electricity, this is a common misconception. In fact, electrical forces had been recognised for more than a thousand years before Franklin's time, and scientists had been working extensively with static electricity.
However, Franklin did play a crucial role in pioneering the study of electricity. In 1752, he proposed an experiment to investigate the nature of lightning and electricity, which were not yet fully understood at the time. This proposal would come to be known as the kite experiment.
Franklin's kite experiment was designed to demonstrate the connection between lightning and electricity. The experiment involved flying a kite with a pointed conductive wire attached to its apex during a thunderstorm. The wire would act as a lightning rod, attracting lightning and conducting the electrical charge down the wet kite string to the ground.
Franklin conducted this experiment with the assistance of his son, William. They chose to fly the kite during a thunderstorm, with Franklin staying on the ground while his son flew the kite from the cover of a nearby shed. A metal key was attached to the kite string, and as Franklin had predicted, it drew an electrical charge from the lightning, proving that lightning and electricity were indeed the same phenomenon.
This experiment was a significant milestone in the understanding of electricity and its potential as a power source. It sparked further exploration and experimentation, leading to advancements in the field of electrical engineering and the development of practical applications for electricity in everyday life.
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Thomas Edison: developed the first practical electric lightbulb
Thomas Edison, born in Ohio in 1847, is often credited with developing the first practical electric lightbulb. However, it is essential to understand that the history of the lightbulb involves the collective efforts of numerous inventors and scientists over many years.
Edison's journey towards the creation of the lightbulb began with his work as a telegraph operator, which sparked his initial interest in electricity. He established a laboratory in his family home in Michigan, where he conducted various experiments. In 1869, Edison set up an invention workshop in Newark, New Jersey, where he delved into the development of electrical devices.
Edison's focus on the lightbulb was driven by the desire to create a smaller and weaker version of the existing arc lamps, making them suitable for home use. From 1878 to 1880, he and his associates at his laboratory in Menlo Park, New Jersey, worked tirelessly on thousands of theories and experiments to develop an efficient incandescent lamp. The key challenge was finding the right material for the filament. Edison and his team tested various materials, including cardboard, platinum, carbon, and eventually bamboo.
In January 1879, Edison produced his first high-resistance, incandescent electric light. It consisted of a thin platinum filament in a glass vacuum bulb. However, this early prototype only burned for a few hours. Edison's persistence paid off when, in October 1879, he and his team created a lightbulb with a carbonized filament of uncoated cotton thread that could last for 14.5 hours. They continued refining the filament until they achieved a remarkable 1,200-hour lifespan with a bamboo filament, which became the standard for the Edison bulb for the next decade.
Edison's contributions extended beyond the lightbulb itself. He modelled his lighting technology on the existing gas lighting system and demonstrated the distribution of electricity from a central generator in London in 1882. Additionally, he established the world's first commercial power utility, the Pearl Street Station in lower Manhattan, and developed the first electric meter to track electricity consumption. These innovations were crucial in bringing electricity into homes and businesses.
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Nikola Tesla: pioneered alternating current (AC) power transmission
The study of electricity dates back to ancient times, with the English scientist William Gilbert making a careful study of electricity in 1600. However, it was Nikola Tesla, a Serbian-American inventor and engineer, who pioneered alternating current (AC) power transmission. Tesla arrived in the United States in 1884 at the age of 28 and soon began making groundbreaking discoveries in the field of electrical engineering.
Tesla's work focused on alternating current (AC) power transmission, which revolutionised the way electricity is generated, transmitted, and distributed. He understood that AC power did not have the limitations of DC power, which was difficult to transmit economically over long distances. In 1885, Elihu Thomson, a competitor of Thomas Edison, sketched a basic AC system that relied on high-voltage transmission lines. However, there was a missing link—the AC motor.
Tesla built what became known as a polyphase induction motor, based on multiple alternating currents. In 1887, he filed for U.S. patents describing a complete AC system based on his induction motor, including generators, transformers, transmission lines, and lighting. His lecture on this revolutionary new system to the American Institute of Electrical Engineers caused a sensation and convinced experts of the superiority of AC power over DC.
Despite an anti-AC campaign initiated by Edison, Tesla's work ultimately helped the United States adopt AC power transmission. This work laid the foundation for modern electrical technology and changed the way we use energy, allowing us to light up our homes at night. Today, the majority of the electrical grid is still AC, a testament to Tesla's pioneering contributions to the field of electricity.
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William Gilbert: coined the term 'electricus'
The study of electrical phenomena dates back to antiquity, with theoretical understanding progressing slowly until the 17th and 18th centuries. The English scientist William Gilbert is credited by many as the "father of electricity and magnetism". He was born on May 24, 1544, in Colchester, Essex, and received his doctorate from Cambridge University in 1569. In 1600, Gilbert wrote "De Magnete", a book entirely in Latin that presented the results of his extensive research into the nature of magnetism and electricity. He made a careful study of electricity and magnetism, distinguishing the lodestone effect from static electricity produced by rubbing amber.
Gilbert coined the Neo-Latin word "electricus" ("of amber" or "like amber", from "elektron", the Greek word for "amber") to refer to the property of attracting small objects after being rubbed. This association gave rise to the English words "electric" and "electricity", which made their first appearance in print in Thomas Browne's "Pseudodoxia Epidemica" of 1646. Before Gilbert, no one had used the terms "magnetic pole", "electric force", and "electric attraction"; he was also the first to clearly distinguish between magnetic and electrical forces.
Gilbert's work laid the foundation for future discoveries about electricity. He observed that magnetic forces often produced circular motions and began to connect the phenomenon of magnetism with the rotation of the Earth, leading to his discovery of the Earth's own magnetism. This provided the theoretical foundation for the science of geomagnetism. By publishing "De Magnete", Gilbert shattered many popular scientific theories and became the first person to fully explain the workings of a magnetic compass. Rejecting the notion that Earth was at the centre of the universe, he proposed that it was a magnetic planet, with polarity corresponding to its north and south poles.
While Benjamin Franklin is often credited with discovering electricity in 1752 when he proved that lightning consisted of electricity by flying a kite during a thunderstorm, it is important to recognise that no one person can be solely credited with discovering electricity. Instead, several individuals made contributions to the study of electricity over centuries, including Franklin, who sparked the idea of using electricity as a power source. Other pioneers include Michael Faraday, an English scientist who made groundbreaking discoveries in the field of electromagnetism and formulated the laws of electromagnetic induction; Thomas Edison, an American inventor who contributed to the practical application of electricity and developed the first successful electric lightbulb; and Nikola Tesla, a Serbian-American inventor and engineer who made advancements in electrical engineering and pioneered alternating current (AC) power transmission.
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Frequently asked questions
American polymath Benjamin Franklin is most credited with discovering electricity in 1752. In an experiment, he attached a wire to a kite during a thunderstorm, which showed that lightning consists of electricity.
Alessandro Volta invented the first genuine electric battery, known as the voltaic pile, in 1800.
Michael Faraday is considered one of the fathers of electricity and magnetism. He discovered electromagnetic induction, which laid the foundation for electric power generation.
Nikola Tesla, Thomas Edison, Hertha Ayrton, Charles Fritts, and William Gilbert are some other pioneers of electricity.
