and attracts or repels other magnets. Here‚ we will discuss more on electromagnets. An electromagnet is made from a coil of wire that acts as a magnet when a current passes through it but stops being a magnet when the current stops. Often‚ the coil is wrapped around a core of "soft" ferromagnetic material such as steel‚ which greatly enhances the magnetic field produced by the coil. Around a typical bar magnet - or any magnetized object (like the Earth‚ for example) - there are lines of magnetic
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wireless telegraphy (Regal). 3. However‚ Nicola Tesla was a major contributor to the invention of the radio transmitter (Regal). a. He developed the “Tesla Coil” which was the beginning of the type of high-voltage alternator needed for continuous-wave radio communication (Regal). b. In St. Louis in 1895‚ Tesla demonstrated the principles of wireless communication for the first time when he transmitted vibrations with a transmitter and receiver (Regal). c. Tesla‚ may have built a form of the radio prior
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resistive losses. Energy transfer by induction is usually magnetic but capacitive coupling can also be achieved. Electrodynamic induction method Electromagnetic induction can work on the principal of a primary coil generating a predominantly magnetic field and a secondary coil being within that field so a current is induced in the secondary. Coupling must be tight in order to achieve high efficiency. As the distance from the primary is increased‚ more and more of the magnetic field misses the
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Generators produce electricity by means of a principle discovered independently by two physicists in 1831 - Michael Faraday of England and Joseph Henry of the United States. Faraday and Henry found that they could produce electricity in a coil of copper wire by moving the coil near a magnet. This process is called electromagnetic induction. A simple generator (see Figure 1 below) consists of a single loop of wire turning in a magnetic field. Electricity is produced only while the loop is rotating. As the
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CGHS Physics Trial HSC Examination 2008 Page 1 Student number ……………………….. Teacher …………………………………….. Cheltenham Girls High School 2008 Higher School Certificate Trial examination Physics TASK WEIGHTING: 35% General Instructions • Reading time – 5 minutes • Working time – 3 hours • Write using black or blue pen • Draw diagrams using pencil • Board-approved calculators may be used • A data-sheet‚ formulae sheets and Periodic Table are provided at the back of this paper Total marks –
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CALIFORNIA STATE UNIVERSITY‚ NORTHRIDGE WiTricity: Wireless Power Transfer A Graduate Project submitted in fulfillment of the requirements For the Degree of Master of Science in Electrical Engineering By Pranit Yeole MAY 2013 The Graduate Project of Pranit Yeole is approved: _________________________________________________ Dr. Ali Amini ____________ Date _________________________________________________ Dr. Ahmad Bekir ______________ Date _________________________________________________
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Atomic Emission Spectroscopy Dr M. Al-Harahsheh Comparison: Flame and Plasma atomization methods • Excitation and atomization for absorption: – Traditionally based on • • • • • • 1) 2) 3) 4) 5) 6) 7) 8) flame Electrothermal arc and spark & Plasma find important application ICP is the most important but excitation for emission spectrometry offers increased atomization/excitation Lower inter-element interference due to high T emission from multiple species
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electromagnet consisting of a coil of insulated wire wrapped around an iron core. The strength of magnetic field generated is proportional to the amount of current. Current (I) through a wire produces a magnetic field (B). The field is oriented according to the right-hand grip rule. An electric current flowing in a wire creates a magnetic field around the wire (see drawing below). To concentrate the magnetic field‚ in an electromagnet the wire is wound into a coil with many turns of wire lying side
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The History of Electricity Our knowledge of electricity has started from very humble beginnings when you look at where we are today. Electricity has been around for as long as humans have. When lightning strikes ancient people may not have understood what it was or why it happened‚ but they at the very least witnessed it happen. Nature acted as a sort of catalyst to spark the curiosity of early people. It was only until sometime between 624 BC and 546 BC where an understanding of electricity
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SUPER CONDUCTORS Superconductivity is an electrical resistance[->0] of exactly zero which occurs in certain materials[->1]below a characteristic temperature[->2]. It was discovered by Heike Kamerlingh Onnes[->3] in 1911. Likeferromagnetism[->4] and atomic spectral lines[->5]‚ superconductivity is a quantum mechanical[->6]phenomenon. It is also characterized by a phenomenon called the Meissner effect[->7]‚ the ejection of any sufficiently weak magnetic field from the interior of the superconductor
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