German Otto von Guericke made the first electrostatic generator with a ball of sulfur and some cloth. The ball symbolized the earth‚ and he believed that this little replica of the earth would shed part of its electric “soul” when rubbed. It worked‚ and now scientists could study electric shocks and sparks whenever they wanted. A Leyden jar from about the 1910s. Courtesy: David Rickert. As scientists continued to study electricity‚ they began thinking of it as an invisible fluid and tried
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31‚ 32‚ 44) 1. A proton beam in an accelerator carries a current of 125 A. If the beam is incident on a target‚ how many protons strike the target in a period of 23.0 s? 2. A copper wire has a circular cross section with a radius of 1.25 mm. (a) If the wire carries a current of 3.70 A‚ find the drift speed of the electrons in this wire. 3. An aluminum wire having a cross-sectional area equal to 4.00 10–6 m2 carries a current of 5.00 A. The density of aluminum is 2.70 g/cm3. Assume each
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circuit will still continue to work. But parallel circuits are more complex and expensive to create. There is no point to a circuit if you don’t have anything to flow through it‚ so thats where moving electrons known as an electric current is useful. An electric current is the electrons that flow
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understood. Thomas Edison helped change everyone ’s life -- he perfected his invention -- the electric light bulb. Prior to 1879‚ direct current (DC) electricity had been used in arc lights for outdoor lighting. In the late-1800s‚ Nikola Tesla pioneered the generation‚ transmission‚ and use of alternating current (AC) electricity‚ which can be transmitted over much greater distances than direct current. Tesla ’s inventions used electricity to bring indoor lighting to our homes and to power industrial
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An experiment to investigate the factors which affect Resistance in a wire What is resistance? A potential difference (V) applied across a wire of length (l)‚ there is in the conductor‚ an electric field (E). In this electric field the free electrons are not however under continuous acceleration (Ee/m). This is because they repeatedly collide with the moderately massive vibrating atoms losing their kinetic energy. The vibrating atoms having gained this kinetic energy now vibrate more. The resulting
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Bibliography: Robomaid Australia: frequently asked questions‚ 2010‚ viewed 7th August 2013 http://www.robomaid.com.au/faq/ Neto Robotics: Robomaid 770‚ 2013‚ Viewed 8th August 2013 http://www.neatorobotics.com/the-lab/ Electrics: Robomaid 770 robot‚ 2008‚ viewed 8th August 2013 http://www.myshopping.com.au/PR--380143_Robomaid_RM_770_Robot_Vacuum_Cleaner Google image: Robomail 770‚ 2007‚ viewed 8th August 2013 http://www.google.com.au/imgres?q=Robomaid+RM-770&um=1&safe=a
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CHEMICAL EFFECTS OF ELECTRIC CURRENT Conductivity of Liquid Electrolysis Electroplating www.excellup.com ©2009 send your queries to enquiry@excellup.com Finish Line & Beyond The materials‚ which allow electric current to pass through them‚ are good conductors of electricity. On the other hand‚ materials‚ which do not allow electric current to pass through them easily‚ are poor conductors of electricity. You know that metals such as copper and aluminum conduct electricity whereas materials
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Devices 3. Failure Mechanism of Semiconductor Devices Reliability Factor and Failure Mechanism of Semiconductor Devices 3.1 The reliability of semiconductor devices depends on their resistance to stresses applied to the devices‚ such as electric stress‚ thermal stress‚ mechanical stress‚ and external stress (humidity‚ etc.). If part of a device has a particularly weak structure‚ the weak part may react extremely to the applied stress‚ and such an extreme reaction may cause serious failures
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ampere of the electric current. All the possible factor that will effect to the volt of the current • The Length of the wire • The Diameter of the wire • Temperature • Magnetism Aim To determine the effect of the length of the wire on the ampere of the electric current. Hypothesis Nichrome is an alloy(a metal made by combining two or more metallic elements) that is made out of 80% nickel and 20% chromium. I know that it is a resistant material that will slow electric current down‚ therefor
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TLE Electron The electron (symbol: e−) is a subatomic particle with a negative elementary electric charge. An electron has no known components or substructure. It is generally thought to be an elementary particle.[2] An electron has a mass that is approximately 1/1836 that of the proton. The intrinsic angular momentum (spin) of the electron is a half-integer value in units of ħ‚ which means that it is a fermion. The antiparticle of the electron is called the positron; it is identical to the
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