Scientific+Advancements

= Electromagnetism and The Ohm's Law By: Juliet Steele and Clare Dinh = ===Electromagnetism profondly shaped scientific theories of the 20th century and advanced experiments, while the Ohm's Law (a unit that measures electrical resistance) was used to measure electrical resistance and help understand voltage, current, and electrical resistance.===

Electromagnetism


====The development of electromagnetic theory had a huge impact on the world at the time Jane Austen wrote Pride and Prejudice. Electromagnetism is, simply put, magnetism produced by electric currents. Several 19th century scientists developed theories on electromagnetism. Eventually, these theories laid the foundation for modern physics. More interestingly, those who experimented with electromagnetism invented some remarkable ways to apply it to modern life. For example, the invention of the modern light bulb is related to electromagnetic theory. X-rays used to diagnose injuries also came from such theory. The discovery of radio waves “sparked 20th century communications revolution.” Electromagnetic theory seems to have its origins in 1820 when a Danish scientist, Hans Christian Oersted placed a wire near a magnetic compass. When the electric current was applied to the wire, the compass needle moved. The English physicist Michael Faraday took this idea several steps further and developed the first electric motor. ==== ====The development of electromagnetic theory also has a connection to the vast changes in the social hierarchy. Many of the characters in Pride and Prejudice are concerned with social class. Some of the pioneers in electromagnetism did not come from backgrounds that predicted they would change the world. Faraday came from a working class family. He was the son of a blacksmith. Other pioneers were George Green, a self-taught mathematician, and Andre Marie Ampere, who never received a university degree. The science of electromagnetism developed “rapidly during a time of rapid social and economic change by men who would not have been considered educated by the traditional standards.” ====

Ohm's Law
====The Ohm's law is used frequently today. It became very useful and very helpful throughout our everyday lives. For example, as the knob rotates on a dimmer switch, electric resistance changes. The ohm's law tells us that the flow of current is proportional to the voltage, and the inversely proportional to the resistance. Since the voltage across the switch does not change, the only thing that changes is the resistance when the dimmer switch knob turns. The Ohm's law can help us with measuring electrical resistance.==== ====The Ohm's law was named after a German physiciist named Georg Simon Ohm. He was the first man to investigate current electricity. He later became a professor of mathematics at the Jesuits' College at Cologne in 1817. Ohm's work began to be recognized by people all around the world. Since his work was beginning to be recognized, he was awarded the Copley Medal of the Royal Society of London and he was a foreign member a year later. ("Georg Simon Ohm"). ====

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====The Ohm's law is a unit that measures electrical resistance. It was used to focus the relationship between voltage, current, and electrical resistance. This quotes explains how to use the Ohm's law, "The law states that the current in an electric circuit is equal to the voltage divided by the resistance" ("Ohm's Law"). This means that when the current increases, it cause the voltage to increase too. WHen the voltage decreases, the resistance increases. The physical unit of electrical resistance is named abter Ohm ("The Ohm's Law"). ====



Work Cited
"Georg Simon Ohm." Encyclopaedia Britannica Online Academic Edition. N.p., n.d. Web. 15 Feb. 2011. "The Ohm's Law" Britainnica. N.p., n.d. Web. 15 Feb. 2011. "Ohm's Law" Science Reference Center. N.p., n.d. Web. 15 Feb. 2011. MAKE Presents: Ohm's Law. Youtube. N.p., n.d. Web. 6 Mar. 2011. Ohm's Law Triangle. N.d. N.p., n.d. Web. 7 Mar. 2011.