Wireless Charger for Low Power Devices Chapter 1 1.1 Introduction We live in a world of technological advancement. New technologies emerge each and every day to make our life simpler. Despite all these‚ we still rely on the classical and conventional wire system to charge our everyday use low power devices such as mobile phones‚ digital camera etc. and even mid power devices such as laptops. The conventional wire system creates a mess when
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Electromagnets! An electromagnet is a type of magnet in which the magnetic field is produced by the flow of electric current. The magnetic field disappears when the current is turned off. Electromagnets are widely used as components of other electrical devices‚ such as motors‚ generators‚ relays‚ loudspeakers‚ hard disks‚ MRI machines‚ scientific instruments‚ and magnetic separation equipment‚ as well as being employed as industrial lifting electromagnets for picking up and moving heavy iron objects
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1. INTRODUCTION Generally when most people think about electronics‚ they may initially think of products such as cell phones‚ radios‚ laptop computers‚ etc. others‚ having some engineering background‚ may think of resistors‚ capacitors‚ etc. which are the basic components necessary for electronics to function. Such basic components are fairly limited in number and each having their own characteristic function. Memristor theory was formulated and named by Leon Chua in a 1971 paper. Chua
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9.2 Space Students learn to: Students: 1. The Earth has a gravitational field that exerts a force on objects both on it and around it define weight as the force on an object due to a gravitational field perform an investigation and gather information to determine a value for acceleration due to gravity using pendulum motion or computer-assisted technology and identify reason for possible variations from the value 9.8 ms-2 gather secondary information to predict the value of acceleration
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A.C current meters Introduction An ammeter is a measuring instrument used to measure the electric current in a circuit. Electric currents are measured in amperes (A)‚ hence the name. Neither type of basic dc PMMC meter movement will correctly indicate an alternating current. There are‚ however‚ four basic types of meter movement that will indicate ac values:- Thermocouple Hot wire Electrodynamometer Iron-vane Electrodynamic ammeters An electrodynamic meter uses an electromagnet instead
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WORKSHEET # 3 1. In the magnetic system of the Figure below two sides are thicker than the other two sides. The depth of the core is 10 cm‚ the relative permeability of the core‚ ur = 2000‚ the number of turns N = 500‚ and the current flowing through the coil is i = 1 A. (a) Determine the flux in the core. (b) Determine the flux densities in the parts of the core. (c) Find the current i in the coil to produce a flux (φ=0.012Wb). 2. A circular ring of magnetic material has a mean length
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and fast. One of the most important uses for electromagnetism is in electronic motors. The main components are a core rod and many copper wires coiling around the iron rod. The coils rotate around the iron rod because of the magnetic force caused by a certain magnetic field on an electric current. While doing so‚ this turns electrical energy into mechanical energy. When this happens‚ normally a gear is attached to the end of the rod. That Gear is connected to another gear and that can be linked to
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book “Optics” by Hecht sections 3.2 and 3.3 Speed of light: EM waves travel in a vacuum with speed c = c = 299‚792‚458 ms-1 exactly They are transverse waves with (vector) E and B field orthogonal to each other‚ for this section bold indicates vector quanties. When far from the source (many wavelengths) the E and B fields are in phase The vector E x B points in the direction of motion Travelling waves can be written as E = E 0 ⋅ ei ( kx −ωt ) and B = B 0 ⋅ ei ( kx −ωt ) 1 µ 0ε 0 Magnitude of B and
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Special electric machines have a large field of application and actual requirements for electromechanical systems clam new and very performing solutions. There are a lot of papers on this subject‚ but anytime is mandatory to do something else to help users to develop high level systems. Main intention of the authors for this paper is to present a modality to analyze and to design a new solution of electric machine only trough finite element method. Actually‚ the users are asking for very performing
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Semiconductors: Band Gap of Germanium and the Hall Effect Friday‚ Section 006 TA: Yilikal Ayino John Greavu with Daniel Erickson & Kevin Haar February 14‚ 2014 PreLab With the new understanding of quantum mechanics and solid-state physics in the 1930’s came the development of semiconductors. Semiconductors are materials such as silicon and germanium in which the current density is non-zero‚ unlike an insulator‚ yet still several magnitudes smaller than that of a conductor. There exists a significant
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