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In electronics, impedance matching is the practice of designing the input impedance of an electrical load (or the output impedance of its corresponding signal source) to maximize the power transfer or minimize reflections from the load.Source and load circuit impedanceIn the case of a complex source impedance ZS and load impedance ZL, maximum power transfer is obtained whenwhere * indicates the complex conjugate. Minimum reflection is obtained whenThe concept of impedance matching was originally developed for electrical engineering, but can be applied to any other field where a form of energy (not necessarily electrical) is transferred between a source and a load. An alternative to impedance matching is impedance bridging, where the load impedance is chosen to be much larger than the source impedance and maximizing voltage transfer (rather than power) is the goal.
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AC Current flow in 120/240 V AC single phase three or four wire systems is frequently misunderstood. This technical brief goes through a step by step process of adding one load at a time to a 120/240 V AC system and looking at the resulting current flows.There is an assumed understanding of basic DC theory, Ohms Law (V=IR), the Power Law (P=VI) and Kirchhoff’s Voltage and Current Laws.1. The sum of the voltage rises equals the sum of the voltage drops around any closed loop.2. The sum of the currents entering a junction equals the sum of the currents leaving the junction.
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Auteur : Thomas Kubala Edition : Delmar Cengage Learning Pages:193 Format: pdf
Designed to give readers the "building blocks" of electricity concepts, the sequence of topics and practical applications in this book will provide a solid foundation in electron theory and movement, direct-current series circuits, parallel circuits, series-parallel circuits, voltage line drops, rotating machinery fundamentals, and more! Electricity 1: Devices, Circuits and Materials, 9th Edition follows the same user-friendly approach that made previous editions so effective, while incorporating updates based on the 2008 National Electrical Code. Featuring current industry terminology, photographs of commonly used electrical equipment, and sample problems with solutions, this is an ideal choice for a first course in basic electricity, house wiring, or commercial installations.
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Auteur: C.L. Wadhwa Edition: New Age International Pages:312 Format :pdfHigh Voltage Engineering has been written for the undergraduate students in Electrical Engineering of Indian and foreign Universities as well as the practising electrical engineers.
The author developed interest in the field of High Voltage Engineering when he was a student at the Govt. Engineering College, Jabalpur. It used to be thrilling to observe large metal spheres flashing over, corona phenomenon on a wire placed along the axis of a cylinder and then recording the corona loss, controlling the wave shapes of impulse voltages etc.
