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27 Cards in this Set
- Front
- Back
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arago
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observed orientation of magnetized iron fillings around a wire carrying electric current
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Ampere
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related electric currents to magnetic fields; formulated right hand rule that became a basic law of electromagnetism to describe the influence of an electric current on a magnet; credited for unit of electric current
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Michael Faraday
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demonstrated mechanical motion to electrical energy conversion; identified electricity from various sources; electrolytic decompositions; electrostatics
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Cyrus West Field
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laid the groundwork for laying the undersea cable; did not take advice of Thompson and regretted it later
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Gauss
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German explorer who created an early form of the telegraph that operated over 2 km away in 1833; laws relating electromagnetic fields to its sources; Gauss' law
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Joseph Henry
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American inventor who created an early form of the telegraph in 1835; he created the model that Morse took; influenced by Sturgeon; improved magnet and made it stronger
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Heinrich Hertz
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created apparatus with a transmitter and receiver that sent waves of electricity back and forth- radio waves and broadcasting
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Morse
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stole idea of the telegraph and patented it; developed large scale telegraph
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Maxwell
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theorist; predicted changes in electric fields will produce magnetic field without electric currents; theorized em waves travel at speed of light;
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Nicholson
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discovered electrolysis
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Oersted
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saw that electricity and magnetism were not separate but related phenomena; published findings in 1820
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Ohm
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dc circuit; law: voltage=currentxresistence
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Sturgeon
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experiemnted with electricity and discovered that when you wrap a piece of coil around iron and connected it to Volta's battery it turned into a stronger magnet that pulled other pieces of iron towards itself
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electromagnetic relay
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carry the signal farther than a piece of continuous wire would practicaly allow: telegraph
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electric telegraph
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invented by Henry and Morse; system of sending a code of dashes and dots that represent letters that can be translated into messages
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coaxial cable
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insulated cable with copper conductor in middle, surrounded by an insulator, then another sheet of copper and then more insulator
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galvanometer
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instrument for detecting electric current
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alternating current
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movement of electric charge that periodically reverses direction
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dynamo
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generates direct current; foundation of the motor
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right-hand rule
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direction of magnetic current; stupid name from ampere
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radio wave
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waves that radiated outward when transmitted
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observations with digital multimeter
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reversed polarity and graph was negative
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multiturn current carrying coil
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arago and ampere; coil has a stronger magnetism than straight wire
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social effects of the telegraph
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info spread faster; universal control of time; foreign correspondence; financial news
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social effects of electric power
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amusement parks; electric street cars; skyscrapers; electric motors and household chores
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two parallel current carrying wires
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current is same way- magnetic fields weaker b/t wires w/ attractive force; current different way- magnetic fields are stronger b/t wires- repulsive force
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problem with long distance telegraph
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limitation of wire resistance used from one end to the other
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