com/lifestyle/10/12/09/scientists-inventing-flood-warning-systems. TJ Manotoc‚ October 12‚ 2009. Basha‚ E. et al.2008. Model-Based Monitoring for Early Warning Flood Detection. Cambridge‚ MA‚ USA: Massachusetts Institute of Technology. Kurtus‚ R. June 2009. Alternating Current (AC) Electricity.
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How voltmeter and ammeter work Measuring Voltage Measuring the voltage between two points of an electrical current can be done with an instrument called a voltmeter. One type of voltmeter is a direct-current voltmeter. When taking a voltage reading the instrument is placed across the portion of the circuit that is to be measured. Direct-Current Voltmeter The direct-current voltmeter has a horseshoe shaped magnet‚ with a semicircular piece of soft iron attached to each end of the magnet. The iron
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Current and Resistance Physics Investigation Aim: Investigate how the length of a wire affects the current and resistance of a wire. Prediction and Hypothesis: I think as you increase the length of the Constatan wire‚ you also increase the amount of resistance. The current is the flow of electrons; the current is dependent on the amount of voltage‚ which is applied. Voltage is the push given to the current. The current has to go through a circuit‚ which contains resistance so if you increase
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Description A saturable reactor in electrical engineering is a special form of inductor where the magnetic core can be deliberately saturated by a direct electric current in a control winding. Once saturated‚ the inductance of the saturable reactor drops dramatically. This decreases inductive reactance and allows increased flow of the AC current. II. Function/Operation Figure 1. This scheme controls the output voltage by varying the impedance of a saturable reactor as shown in diagram. This
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Electrical circuit is a path which electrons from a voltage or current source flow. Electric current flows in a closed path called an electric circuit. The point where those electrons enter an electrical circuit is called the "source" of electrons. The point where the electrons leave an electrical circuit is called the "return" or "earth ground". The exit point is called the "return" because electrons always end up at the source when they complete the path of an electrical circuit. The part of an
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and operation is provided by rotating an iron-core bearing supported within a housed stator assembly. The housing is passivized stainless steel. The stator consists of a primary excitation coil and a pair of secondary output coils. A fixed alternating current excitation is applied to the primary stator coil that is electromagnetically coupled to the secondary coils. • This coupling is proportional to the angle of the input shaft. The output pair is structured so that one coil is in-phase with the
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after the two would work nonstop to improve Edison’s inventions. Several months later the two parted ways due to a conflicting business- scientific relationship. In 1885 Tesla‚ received funding for the Tesla Electric Company. Tesla designed the alternating current (AC) electric system‚ which quickly became the leading power system of the 20th century. At the end of the 19th century‚ Tesla patents the “Tesla coil which laid the foundation for wireless
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the A.C. current to D.C. was by means of a commuter. Output of the dynamo was limited due to the rotating speed of the conductor 2. Alternator In the alternator the magnetic field rotates‚ while the conductor is stationary. This allows the alternator to operate at higher speeds than the dynamo‚ giving greater output. Generating an electric current The simple dynamo When a coil of conducting wire is rotated between two magnets an E.M.F is produced and will cause an alternating current to flow
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I am going to investigate how the resistance of the wire affects a current flowing through a wire. I know that as resistance changes‚ current changes‚ as Ohm’s law: I = V/R. If one part of an equation changes‚ the equal must be done to the opposite side. To detect how resistance affects current‚ I must first discover what factors affect resistance. These factors are: · Length of the wire if a wire is longer; there are more particles for electrons to move through‚ and therefore more resistance
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CHAPTER I ------------------------------------------------- INTRODUCTION 1.1 Introduction Portable electronic devices are very popular nowadays. As the usage of these portable electronic devices is increasing‚ the demands for longer battery life are also increasing. These batteries need to be recharged or replaced periodically. It is a hassle to charge or change the battery after a while‚ especially when there is no power outlet around. Therefore‚ our team is inspired to design a wireless
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