Electronics 1 See over for Question 1 QUESTION 1 The input current drawn for an ac source line connected to a power converter is indicated in figure Q1‚ together with the ac input voltage of the line to neutral of the supply. The current waveform is flat-topped quasi-square of amplitude 150A. The ac source voltage is given by v = Vmax sin ω t where Vmax is 340 V‚ ω = 2π f ‚ where f is the supply frequency‚ at 50 Hz. vs 150 A 120° 60° −150 A 75° 120° 60° is sec Figure
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device for controlling a relatively large current between or voltage across two terminals by means of a small control current or voltage applied at a third terminal. amplification consists of magnifying a signal by transferring energy to it from an external source The Field Effect Transistor(FET) | The bipolar Junction Transistor (BJT) | is an active device(gate ‚ drain ‚ source)it is a voltage controlled valve.The gate voltage VGS controls the drain current (1D). | is an active deviceis
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changed systematically. Voltage supplied to the electrodes however can be easily changed and adjusted. Thus this experiment will attempt to find the relationship between Voltage applied to the electrodes and the rate of electrolysis. What is the relationship between Voltage supplied and rate of electrolysis? Variables and definitions The rate of electrolysis is defined as mass of Cations of the electrolyte produced at the cathode per unit of time. Independent variable – Voltage supplied to the electrodes
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transformers are used to transform voltage from a higher voltage to a lower voltage. Electric transformers can transform alternating current from one circuit into another through electromagnetic induction. This generally consists of ferromagnetic core and two or more coils called windings. It can either be a single-phase or a three-phase configuration. You have to remember certain specifications when searching for electrical transformers. These include: maximum secondary voltage rating‚ maximum secondary
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supply the number of generating units connected to a system busbar are varied suitably . The connection of an incoming alternator to system bus‚ ie; synchronization requires fulfillment of the condition like the same phase sequence equality of voltages and frequency between the incoming machine and frequency between the in coming machine and busbar. In order to order to overcome the 9 technical drawbacks of the conventional synchronization methods we can introduce a microprocessor based system
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Power Spectrums of Stator Current for Stator Inter-turn Fault at No-Load Condition‚ (a) When DC Voltage 460 Volt and Slip 0.01‚ (b) When DC Voltage 470 Volt and Slip 0.01‚ (c) When DC Voltage 480 Volt and Slip 0.01 However‚ for creation of stator inter-turn fault we have exceded overvoltage upto 480 V. Because for inter-turn fault the faulty current will be much higher than the rated current
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electrode. In Part 2‚ the Nernst equations applied to the voltage measurement of a cell with nonstandard copper ion concentration. A solution of 0.0010 M Cu2 + is prepared‚ and the voltage of the cell: Zn(s)| Zn2+(1.0 M) || Cu2+ (0.0010 M) | Cu(s) is measured. The measured voltage is compared to that calculated from the Nernst equation. In part 3‚ the solubility product constant of AgCl is determined from the Nernst equation and the voltage of a cell in which the zinc half-cell is connected to a solution
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----------------------------------------------7 4.2 Unbalanced fault Calculations ------------------------------------------------------------9 5. Active and Reactive Power Fl ow-----------------------------------------------------------13 6. Methods of Voltage and Frequency Control-----------------------------------------------15 7. Conclusions-------------------------------------------------------------------------------------16 8. References--------------------------------------------------------------------------------------17
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A hybrid nanomemristor/transistor logic circuit capable of self-programming Julien Borghetti‚ Zhiyong Li‚ Joseph Straznicky‚ Xuema Li‚ Douglas A. A. Ohlberg‚ Wei Wu‚ Duncan R. Stewart‚ and R. Stanley Williams1 Information and Quantum Systems Lab‚ Hewlett-Packard Laboratories‚ 1501 Page Mill Road‚ Palo Alto‚ CA 94304 Edited by Konstantin Likharev‚ State University of New York‚ Stony Brook University‚ and accepted by the Editorial Board December 19‚ 2008 (received for review July 9‚ 2008) Memristor
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inverter has been developed for the three-phase four-wire power quality compensators. When it is applied to medium and large capacity compensators‚ the voltage stress across each switch is so high that the corresponding causes large electromagnetic interference. The multilevel voltage source inverter topologies are good substitutes‚ since they can reduce voltage stress and improves output harmonic contents. The existing three-level neutral point clamped (NPC) inverter in threephase three-wire systems can
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