MICROCONTROLLERS A microcontroller (sometimes abbreviated µC‚ MCU) is a small computer with similar components as a standard personal computer only integrated on to a single chip and usually dedicated to a single task. The fundamental components include a processor core (C.P.U)‚ memory‚ system clock and programmable input/output peripherals. Microcontrollers are designed for embedded applications‚ in contrast to the microprocessors used in personal computers or other general purpose applications
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Thomas Edison life and inventio 1.Thomas Edison was a famous American inventor so every American people know him not American people even all of the world he born on (feb‚ 11‚ 1847) in Milan Ohio. 2.Inventor Thomas Edison created such great innovations as the practical incandescent electric light bulb and the phonograph. A savvy businessman‚ he held more than 1‚000 patents for his inventions. 3.Thomas Edison rose from humble beginnings to work as an inventor of major technology. Setting up a lab
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Skills and Attitude that an Underwater Welder Should Have Everyone in search of a career or a job to put itself into‚ to have profit‚ to earn for a living‚ and to support their family for their needs and their wants‚ in other words to earn money . The list of reasons why a person is in need of money could be infinite. But‚ in the general public‚ one compete each other in order to employ themselves. In these cases‚ skills and attitudes are a method of obtaining the job or career that a person wants
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onecordless phone battery. An electric battery is a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy. Each cell contains a positive terminal‚ or cathode‚ and a negative terminal‚ or anode. Electrolytes allow ions to move between the electrodes and terminals‚ which allows current to flow out of the battery to perform work. Primary (single-use or "disposable") batteries are used once and discarded; the electrode materials are irrevesibly
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Chem 16 Notes UPD Should only be a supplement to discussions Table of Contents* [A] Lecture [1] Thermodynamics [2]Energy [3]Enthalpy [4]Hess’s Law [5]Determining Enthalpy [6]Heat Capacity [7]Calorimetry [8] Entropy [9] Gibb’s Free Energy [10] Waves [11] Quantum Theory [12] Quantum Numbers [13] Electron Configuration [14] Periodic Table [15] Periodic Trends KSev [16] Chemical Bonding [17] Formal Charge [18] Resonance Structure [19] Bonds [20] VSEPR [22] Valence Bond Theory [22] Molecular Orbital
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N12/4/CHEMI/SPM/ENG/TZ0/XX 88126104 CHEMISTRY standard level Paper 1 Friday 9 November 2012 (afternoon) 45 minutes INSTRUCTIONS TO CANDIDATES • Do not open this examination paper until instructed to do so. • Answer all the questions. • For each question‚ choose the answer you consider to be the best and indicate your choice on the answer sheet provided. • The periodic table is provided for reference on page 2 of this examination paper. • The maximum mark for this examination
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neon lights: -consists of brightly glowing electrified glass tubes or bulbs that contain rarefied neon or other gases History: -Neon (the element) was discovered in 1898 by William Ramsay and Morris W. Travers. After they had discovered neon‚ they had explored neon’s many properties using an electrical gas discharge tubes. They later wrote that “the blaze of crimson light from the tube told its own story and was a sight to dwell upon and never forget.” -following neon’s discovery‚ neon tubes
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electron microscope visualises objects using a thin beam of rapidly moving electrons that interfere with the specimen placed in the tube. In a TEM‚ the electrons are emitted by the electron gun in the cathode ray tube‚ and then accelerated by the anode. They then pass through a small aperture‚ which forms them into a beam‚ and into the vacuum inside the tube. The electromagnetic lenses around the tube of the electron microscope maintain the electron beam and focus it within the centre of the tube
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AP Chemistry: Chapter 17 Student Notes Objectives 17.1a: Review Redox Assign Oxidation Numbers to the following: a. HNO3 b. PbSO4 c. (NH4)2Ce(SO4)3 Balance the following in acidic medium Al (s) + MnO4- (aq) Al3+ (aq) + Mn2+ (aq) Balance the following in a basic medium Mg (s) + OCl- (aq) Mg(OH)2 (s) + Cl- (aq) Balance the following Redox Reaction: The big nasty problem K4Fe(CN)6 + KMnO4 + H2SO4 KHSO4 + Fe2(SO4)3 + MnSO4 + HNO3 + CO2 +H2O 17.1: Galvanic Cells
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(1) 4. Which of the two is paramagnetic:V+4 or V+5 and why? (1) 5 How cathode rays are originated in the discharge tube and how their origin differs from the origin of anode rays? 6 When is a cation highly polarizing? Which alkali metal has the highest polarizing power? (1) 7.Why is KO2 paramagnetic?
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