Earth Faults in Extensive Cable Networks Electric Distribution Systems Anna Guldbrand Licentiate Thesis Department of Measurement Technology and Industrial Electrical Engineering 2009 Department of Measurement Technology and Industrial Electrical Engineering Faculty of Engineering Lund University Box 118 221 00 LUND SWEDEN http://www.iea.lth.se ISBN:978-91-88934-49-9 CODEN: LUTEDX/(TEIE-1057)/1-129/(2009) © Anna Guldbrand‚ 2009 Printed in Sweden by Media-Tryck‚ Lund University Lund
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Law and also find the resistance of the resistor. I (ampere) I(ampere) 1.0 1.0 2 1.5 2.0 2.0 2.5 2.5 3.0 3.0 V (volt) V(volt) 4.0 4.0 6.0 6.0 8.0 8.0 10.0 10.0 12.0 12.0 4. What are ohmic conductors? What are non ohmic conductors? Give example 5. Draw the VI graph for an ohmic and a non ohmic conductor. 6. Calculate the number of electrons constituting one coulomb of charge? 7. A piece of wire is redrawn by pulling it until its length is tripled. Compare the new resistance with the original value
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CHAPTER 1 : INTRODUCTION 1.1 Introduction Recently‚ we often hear cases of theft manhole made of steel. These thefts often occur because the steel is very valuable when sold. One of my neighbors asked if there are tools that can prevent theft drains. From there I got the idea to create an alarm that can prevent theft from stealing the drain cover becoming increasingly. We begin by examining the case drain theft either inside or outside the country. Too many cases that have occurred that resulted
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Name _____________________ Battery‚ resistance‚ and current – Lab 17 Go to http://phet.colorado.edu/en/simulation/battery-resistor-circuit and click on Run Now. Batteries‚ Resistance and Current “Battery-Resistor”: Check “show battery” and “show cores”‚ watch what happens‚ adjust some variables 1. Why do electrons (blue dots) move? Draw a diagram of the battery‚ label the flow of electrons. The flow of current (+) is opposite; draw this and note if toward or away from + terminal
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measurement of the electrical resistance of a material or electronic component‚ usually in ohms. Ohmmeters typically use an ammeter to measure current through the material after it has been given some set voltage by the ohmmeter; the direct-current resistance of the sample can then be directly determined through Ohm’s law. Resistance is measured in ohms. It can be calculated from the potential difference across a component and the current flowing through it. The total resistance of a series circuit
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Construct a line graph of the data in the previous table. Put all three sets of data on the same table. DISCUSSION – The calculated unknown resistances and line graph confirmed Ohm’s Law because the resistance equals potential over current‚ or R = V/I. each time‚ the unknown resistance was approximately equal to the Ohm’s of the resistor‚ therefore confirming Ohm’s Law. An ammeter is connected in series because its purpose is to measure the current in the
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leaving the junction. These laws‚ however‚ cannot be proven or tested without the aid of a multimeter. A multimeter is an instrument designed to measure electric current‚ voltage‚ and usually resistance‚ typically over several ranges of value. The multimeter has different programs to measure voltage‚ current‚ resistance‚ etc. produced from one of two types of circuits. The first type of circuit is a series circuit. A series circuit is a circuit in which the components are arranged end to end in such a
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series resistance. It makes the solution of complicated networks (particularly‚ electronic networks) quite quick and easy. The Thevenin’s theorem‚ as applied to d.c. circuits‚ may be stated as under: The current flowing through a load resistance RL connected across any two terminals A and B of a linear‚ active bilateral network is given by VOC || (Ri + RL) where VOC is the open-circuit voltage (i.e. voltage across the two terminals when RL is removed) and Ri is the internal resistance of the
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Protection Devices LESSON PLAN ECT0313 Electrical Devices and Control Location R203/R209 Chapter Protection Devices 14 Prepared by Kamarudin Objectives 1. Observe and practice safety measures in electrical control. 2. Practice proper protection of electric motor References Media 1. Handbook of electrical motor control system‚ U.S. Eswar‚ Tata McGraw Hill Publishing Company Limited 1. OHP 2. Electrical Control 1‚Theoretical Part1‚ Voest-Alpine‚ Austria. 2
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dc Circuits Simple Electrical Diagrams For single-source parallel networks‚ the source current (I ) is equal to the sum of the individual branch currents. s Is = I1 + I 2 For a parallel circuit‚ source current equals the sum of the branch currents. For a series circuit‚ the applied voltage equals the sum of the voltage drops. V V In this first example‚ we will calculate the amount of current (I) in a circuit‚ given values of voltage (E) and resistance (R): What is the
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