Michael Faraday was a chemist and physicist from England. He invented electromagnetic induction in 1831. Electromagnetic induction as defined by Stuart Bushong is: An electric current is induced in a circuit if some part of that circuit is in a changing magnetic field. This observation is summarized in what is called Faraday’s Law, or the first law of electromagnetics. After a series of different experiments, Faraday determined that an electrical current cannot exist just by the presence of a magnetic field. If magnets are set next to a coil, the meter would generate no current. Yet if the magnets are moved back and forth near the coil, the ammeter indicates a current. Without electromagnetic induction we would not have MRI, and we would not be able to produce x-rays. Auto-transformers, step-up transformers, and step-down transformers use electromagnetic induction to change currents therefore being able to produce kVp, mAs, and DC current using rectifiers when it comes to x-rays. The following paper will describe in brief detail a little of Michael Faraday’s life, how electromagnetic induction came about, how MRI uses electromagnetic induction to function, and an explanation on how auto-transformers, step-up transformers, and step-down transformers work and change currents to produce x-rays. Electromagnetic induction is truly a phenomenon in this day and age. If it wasn’t for Faraday’s discovery, the medical field would definitely be missing out on one of the most important medical concepts to date. Faraday’s inventions helped to form the foundation of electric motor technology, and it is because of his efforts that electricity is so important in the technology world.
Electromagnetic Induction
Michael Farada...
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Electromagnetic induction is truly a phenomenon in this day and age. If it wasn’t for Faraday’s discovery, the medical field would definitely be missing out on one of the most important medical concepts to date. Auto-transformers, step-up transformers, and step-down transformers are all governed by electromagnetic induction. They would not be able to function without it, and neither would we. Faraday’s inventions helped to form the foundation of electric motor technology, and it is because of his efforts that electricity is so important in the technology world today.
Works Cited
Bushong, S. C. (2008). Radiologic science for technologists: Physics (9th ed.). St. Louis, MO: Mosby, Elsevier.
British Broadcasting Corporation. (2011). Michael faraday history. Retrieved from http://www.bbc.co.uk/history/historic_figures/faraday_michael.shtml
was first conceived by Michael Faraday in the year 1832 in his Backerian Lecture to
Nikola Tesla (1856-1943) was an eccentric man that was many lifetimes ahead of his generation. He was a man that dreamed of giving the world an unlimited supply of wireless energy. His genius imagination allowed him to think outside the box and solve issues that others had thought were unsolvable. Nikola Tesla proposed his vision for a system powered by an alternating current generator to Thomas Edison and was shot down because Thomas Edison’s power structure had already been established using a direct current system. The two butt heads however Nikola Tesla was relentless. After being used and rejected by Thomas Edison, Nikola Tesla picked himself and went toe to toe with the most prolific inventor. The stage for David vs Goliath was set. Through Nikola Tesla’s borderline obsession to solve the design for an alternating current motor and sacrificing his own opportunity to become a wealthy man, we now live in a very efficient world where everyone reaps the rewards of his genius, few know his name, and even fewer know what he did.
Johnston, J. (2012). Essentials of Radiographic Physics and Imaging. St Loius, Missouri: Elsevier Mosby Publishing.
Electric guitars are devices that generate sound from a set of pickups that convert string vibration into electrical signals for amplification. The sound starts out as vibrations the musician creates while playing. These vibrations are picked up by the pickups of the guitar. What are pickups? Pickups are permanent magnets wrapped around in a coil. Since the strings are made with a special material called ferromagnetic, they interact with the magnetic fields in the pickups and force electrons to move in the loop. Moving electrons can generate a signal that can be read by the amplifier.
Although Faraday was unsuccessful when it came to money, he was very successful in the field of science, namely electric science. One of his most important discoveries is that of electro-magnetic induction. It was this experiment, and others of the like, that brought about the discoveries of Maxwell, Rutherford, and Einstein, and elevated Faraday from the son of a poor blacksmith, to a great man of modern science.
Radiology is one of the few so-called “physical-science”-based fields of medicine, making it a challenging and rewarding application of an academic interest in science. It combines advanced knowledge of human physiology with principles of atomic physics and nuclear decay, electricity and magnetism, and both organic and inorg...
"Radioisotopes in medicine." World of Physics. Gale, 2007. Science in Context. Web. 19 May 2014.
...late 17th century, and beginning of the 18th century, transportation was favored by American society so much, the wealthier would hire chauffer’s to take people places. So not only did the motor produce a better and more efficient life style, it also created a huge business industry, as we know it today called, “valeting”. The actual motor worked like this. “Two cups filled with mercury would contain a magnet and a wire with one being fixed and the other free to move. Whenever a current was passed through the wire, the free moving magnet or wire would revolve around its fixed partner due to the electromagnet forces being produced.” (History of Innovation). This first motor was a prime example of the fact that movement could be created by electricity and electricity could be created by friction. This motor was the most useful and applicable invention in the 1800’s.
Tesla’s career as an inventor started when he was in his late twenties. He displayed his incredible understanding of electricity and physics when he created his first invention, the induction motor. The induction motor is a small, electric motor that has become a very useful machine. In fact, most household appliances run using Tesla’s induction motor (Vujovic 1). Score one for Tesla. Soon after he invented the induction motor, Tesla moved to America to try his luck at living the American dream. While in New York City, Tesla got the amazing opportunity to work for his hero, Thomas Edison. However, Tesla soon quit working for Edison due to some disagreements between the two inventors. And so with Edison and his men biting at Tesla’s heels, Nikola set out on his own to make a name for himself (Vujovic 1). Tesla soon became Edison’s greatest competitor. While tinkering in his lab with one of his inventions called the Tesla Coil, Tesla discovered that he could send and receive radio signals when his coils were tuned to the exact same frequency...
The topic of this essay is the Tesla Coil. The Tesla Coil was created by a guy named Nikola Tesla. Nikola made it in the year of 1891. Almost a l00 years ago. Nikola Tesla Died in 1993 on January 7th. Besides Nikola Tesla let's talk about what it can do. A tesla coil can light up light bulbs. A large Tesla Coil can light a fluorescent light bulb for up to 50 feet away. I thought that that was pretty cool. Even florescent light bulbs that have been burnt out can still light up from the Tesla Coil. For example a Tesla Coil can produce electrical arcs. The electrical arcs can create volts well above 1,000,000. Nikola Tesla himself has set the highest record of electrical arcs of 100,000,000 volts.Tesla Memorial Society said “Tesla himself got
Nikola Tesla is regarded as one of the most brilliant inventors in history. His work provided the basis for the modern alternating current power system, as well as having developed both radio and the fluorescent light bulb. He worked with Thomas Edison and George Westinghouse, among others. He was also widely misunderstood by his peers and the public at large.
Thomas Alva Edison is one of the most famous inventors. He saw many changes take place in his lifetime. His inventions were responsible for many of those changes. Some of his inventions were the telephone, the light bulb, the movie projector, and the phonograph. These inventions contributed to modern day, lights, movies, telephones, records and CDs. When Edison was born, there was no such thing as electricity, but by the time he died entire cities were lit by electricity (www.minot.k12.nd.us/edison.html).
In 1831, using his "induction ring", Faraday made one of his greatest discoveries - electromagnetic induction: the "induction" or generation of electricity in a wire by means of the electromagnetic effect of a current in another wire. The induction ring was the first electric transformer. In a second series of experiments in September he discovered magneto-electric induction: the production of a steady electric current. To do this, Faraday attached two wires through a sliding contact to a copper disc. By rotating the disc between the poles of a horseshoe magnet he obtained a continuous direct current. This was the first generator. From his experiments came devices that led to the modern electric motor, generator and transformer.
Humans these days take electricity for granted. We don’t truly understand what life was like without it. Most young adults will tell you their life does not depend on electricity, but they aren’t fooling anyone. They all know that their life depends on electricity; whether it’s television, their phone, Google, or the lights in their house. We need to stop taking those things for granted and give credit where credit is due. That is why I chose to write about the scientists who contributed to the discovery of electricity, which then helped modern scientists fuel the electricity phenomenons we now have today.
The phenomenon called electromagnetic induction was first noticed and investigated by Michael Faraday, in 1831. Electromagnetic induction is the production of an electromotive force (emf) in a conductor as a result of a changing magnetic field about the conductor and is a very important concept. Faraday discovered that, whenever the magnetic field about an electromagnet was made to grow and collapse by closing and opening the electric circuit of which it was a part, an electric current could be detected in a separate conductor nearby. Faraday also investigated the possibility that a current could be produced by a magnetic field being placed near a coiled wire. Just placing the magnet near the wire could not produce a current. Faraday discovered that a current could be produced in this situation only if the magnet had some velocity. The magnet could be moved in either a positive or negative direction but had to be in motion to produce any current in the wire. The current in the coil is called an induced current, because the current is brought about (or “induced”) by a changing magnetic field (Cutnell and Johnson 705). The induced current is sustained by an emf. Since a source of emf is always needed to produce a current, the coil itself behaves as if it were a source of emf. The emf is known as an induced emf. Thus, a changing magnetic field induces an emf in the coil, and the emf leads to an induced current (705). He also found that moving a conductor near a stationary permanent magnet caused a current to flow in the wire as long as it was moving as in the magnet and coiled wire set-up.