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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 : Bari M. Logan, Patricia Reynolds, Ralph T. Hutchings Edition : MosbyPages:294 Format: pdf Language:EnglishThis popular resource uses a unique, oversized format to clearly and thoroughly demonstrate the anatomy of the head and neck. Outstanding dissections and illustrations, osteology, radiography, and surface anatomy photographs capture the full range of anatomical structures. Brief textual explanations accompany every figure, facilitating understanding and study. This 3rd Edition features many new and improved images as well as updates to reflect the latest terminology.
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Auteur : Pierre Ricaud Edition : H.Vial Pages:217 Format: pdf Language:FrançaisSommaire :
Géométrie généralités
Le point
La droite (horizontale, verticale, répartitions)
Les parallèles (fabrication d’un trusquin de menuisier)
Les perpendiculaires (tracés, fabrication d’équerres en bois)
Les angles (méthodes de traçage, reporter un angle, ouverture des porte)
Les triangles
Les quadrilatères : le carré
Les quadrilatères : le losange
Les quadrilatères : le rectangle
Les quadrilatères : le trapèze
Le parallélogramme
Géométrie et perspective
