and to determine the resistance of a given resistor. Theory: Ohm’s law is the assertion that the current through a device is always directly proportional to the potential difference applied to the device. Electric current is the moving of charges from a higher potential to a lower potential. Wires of different material (a copper wire versus a silver wire‚ for example) will produce different currents‚ even if applied the same potential difference. This phenomenon‚ this characteristic respectful to
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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 energy gap between the filled valence – highest range of electron energies normally present at absolute zero – and
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module‚ you should be able to: ♦ ♦ ♦ ♦ ♦ define what an electric charge‚ an electrostatic force‚ electricity‚ a voltage‚ a current and a resistance are; differentiate a conductor from an insulator and a semiconductor; differentiate a series from a parallel connection; differentiate an alternating current from a direct current; and state the relationship between voltage‚ current and resistance in a conductor (Ohm’s law). Let’s See What You Already Know Before studying this module‚ take this simple
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1. In current differential protection the electric currents at all terminals of a protection zone are measured and their weighted sum must be equal to zero (generalized Kirchhoff’s current law). Thus the current differential protection function consists of measuring the sum of the currents and as long as it is zero or near zero no action is taken. In dynamic state estimation based protection‚ all existing measurements in the protection zone are utilized. These measurements include: currents and voltages
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buck converter the supply current is discontinuous which may produce electromagnetic interference (EMI). In order to minimize the EMI problems an interleaved buck converter with continuous supply current has been introduced. Also due to the advantage of improved step-down conversion ratio‚ the interleaved buck converter can be used for high step-down and high frequency applications. The main features of the converter also include lower switch stress and lower output current ripple. The topology consists
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Unit 003: Principles of welding Lesson 1 Handout 1 – Heat sources required for fusion welding The following basic notes have been produced for learners and tutors and if required could be extend. Objectives 3.1.1(a)(b)(c)(i)(ii)(d)(e)(i)(ii)(iii)(iv)(v) Introduction To make a fused joint the heat source must be capable of creating localized fusion in a controlled manner. Basic requirements for the production of a fully fused joint: Temperature should be `significantly above
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closed economy. E) investment always refers to the domestic stock market. 5) A country’s current account A) balance equals the change in its net foreign wealth. B) balance equals the change in its foreign wealth. C) surplus equals the change in its foreign wealth. D) deficit equals the change in its foreign wealth. E) balance equals its GNP. 6) Which of the following is true? A) A country with a current account surplus is earning more from its exports than
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SAFETY PRECAUTIONS IN USING ELECTRICITY:- 1. Avoid water at all times when working with electricity. Never touch or try repairing any electrical equipment or circuits with wet hands. It increases the conductivity of electric current. 2. Never use equipment with frayed cords‚ damaged insulation or broken plugs. 3. If you are working on any receptacle at your home then always turn off the mains. It is also a good idea to put up a sign on the service panel so that nobody turns the main switch ON
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To what extent do you think that the strength of Invicta plcs balance sheets in 2010 and 2011 outweigh their weaknesses? Along with the statement of cash flows and income statement‚ the balance sheet is one of the three most important documents used by investors to understand the financial condition of a company. Structurally‚ the balance sheet is relatively simple in concept. Every company’s balance sheet is comprised of three elements: Assets: often defined as an economic resource which is
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NIGERIAN ECONOMY/GDP AND PRODUCTION Nigeria recorded a Current Account surplus of 11.60 percent of the country’s Gross Domestic Product in 2011. Current Account to GDP in Nigeria is reported by the African Economic Outlook. Historically‚ from 1980 until 2011‚ Nigeria Current Account to GDP averaged 1.2 Percent reaching an all time high of 37.9 Percent in December of 2008 and a record low of -18.7 Percent in December of 1986. The Current account balance as a percent of GDP provides an indication
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