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    Water Billing System

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    tolerable‚ but this should not be assumed without first checking with the manufacturer. • Nominal Operating Current The value of current flow in the coil when nominal voltage is impressed on the coil • Nominal Operating Power The value of power used by the coil at nominal voltage. For DC coils expressed in watts; AC expressed as volt amperes. Nominal Power (W or VA) = Nominal Voltage × Nominal Current. • Coil Resistance This is the DC resistance of the coil in DC type relays for the temperature conditions

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    safety paper

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    Electrical Safety Electricity is all around us‚ no matter where you work there are electrical outlets and machines that run off electricity. Due to how dangerous electricity can be Occupational Safety and Health Administration or OSHA has come up with safety standards when dealing with electricity. Their standards are designed to protect employees who are exposed to the dangers whether it be directly like working on an outlet or indirectly like using the outlet. Safety equipment is available for

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    Pspice Project

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    Abstract In our experiment‚ we analysed three-phase balanced or unbalanced circuits by using PSpice 9.1 and the same way is used to analyse single-phase ac circuit. We determined the value of generator current Iab‚ line current IbB‚ and the phase current IBC. Initially‚ PSpice is used to draw a schematic diagram of circuit A. Under the simulation‚ two major problems were occurred. First‚ a delta connected source is a loop of voltage sources which must be prevented when PSpice is used. To prevent

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    Lab Report

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    figure shows. In the experiment‚ we want to calculate the resonance frequency. We know the current will be maximum when the circuit is driven at its resonance frequency. In addition‚ the amplitude I0 of the AC current in a series LRC circuit depends on the amplitude V0 of the applied voltage and the impedance Z‚ which is a measure of the overall opposition of a circuit to the flow of an electrical current as ‚ So we just need to use the apparatus to measure the maximum voltage. As we know‚ at the

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    Summer 2012 Final

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    Name ______________________________ ECE 201 Final Exam August 4‚ 2010 By signing below‚ I certify that the work submitted on this examination is my own‚ and that I have adhered to fair standards of academic honesty. This exam is void unless signed. _________________________________ signature Instructions a) Write your name on the front page ONLY. b) Show all your work for the following problems so that partial credit can be assigned. Cross out clearly any work which is to be disregarded. Be certain

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    Boost Rectifier

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    adding low-pass filter‚ so that a low distortion of the input current is easily achieved. This controller has been verified via simulation in Simulink using a continuous time plant model and a discrete time controller. Index Terms—power‚ factor‚ correction‚ boost‚ rectifier. I. INTRODUCTION. Single-phase power factor correction (PFC) circuits provide rectification of the line voltage to a regulated dc voltage while shaping the input current to be a sinusoid and in phase with the line voltage [1]. Often

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    electrical symbols

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    Wire Symbols Electrical Wire Conductor of electrical current Connected Wires Connected crossing Not Connected Wires Wires are not connected Switch Symbols and Relay Symbols SPST Toggle Switch Disconnects current when open SPDT Toggle Switch Selects between two connections Pushbutton Switch (N.O) Momentary switch - normally open Pushbutton Switch (N.C) Momentary switch - normally closed DIP Switch DIP switch is used for onboard configuration SPST Relay Relay open

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    CURRENT PROTECTION FUNCTIONS ANSI 50/51 – Phase over-current ANSI 50N/51N or 50G/51G – Earth fault or sensitive earth fault ANSI 50BF – Breaker failure ANSI 46 -Negative sequence / unbalance ANSI 49RMS – Thermal overload CURRENT PROTECTION FUNCTIONS ANSI 50/51 – PHASE OVERCURRENT Three-phase protection against overloads and phase-to-phase short-circuits. ANSI 50N/51N OR 50G/51G – EARTH FAULT Earth fault protection based on measured or calculated residual current values: ANSI 50N/51N:

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    UNISONIC TECHNOLOGIES CO.‚ LTD S8050 LOW VOLTAGE HIGH CURRENT SMALL SIGNAL NPN TRANSISTOR DESCRIPTION The UTC S8050 is a low voltage high current small signal NPN transistor‚ designed for Class B push-pull audio amplifier and general purpose applications. 1 NPN SILICON TRANSISTOR FEATURES * Collector current up to 700mA * Collector-Emitter voltage up to 20 V * Complementary to S8550 Lead-free: S8050L Halogen-free: S8050G TO-92 ORDERING INFORMATION Normal S8050-xx-T92-B S8050-xx-T92-K

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    Transformer

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    project. Too much current flow will heat up the A longer wire in the primary will present more resistance than a short one‚ since the resistance of the wire is determined by its diameter and its length. According to Ohm’s Law‚ current is a function of resistance and current in the formula I=E/R‚ so a lower value of E‚ and a higher value of R will result in less current flow. The heating of the transformer coil and its possible failure results from a high current (larger number of

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