Peaceful resistance to laws positively impacts a free society because it informs and educates the government on how Americans react to certain laws. This can be observed in many of the current events that are going on in America today and have gone on the past the past. One prime example of this is during the 1960’s Civil Rights Movement. Charismatic leaders such as Martin Luther King Jr. peacefully influenced American politics and ultimately brought about the Civil Rights Act of 1964 which disallowed
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The modern steel plant receives low current‚ high voltage power from the generators of the electrical utility company. The purpose of the steel plant primary transformer is to step-down this voltage. The transformer thus provides high current‚ low voltage power for the EAF furnace. Large furnaces with transformers rated at 100MVA or higher is not uncommon. There are usually two stages to this process. The transformer first steps-down the voltage from high to medium levels. There are different
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critical devices that enable wireless products. Unfortunately‚ system designers often choose antenna dimensions in an ad hoc manner. Many times the choice of antenna dimensions is driven by convenience rather than through the examination of fundamental electrical limitations of an antenna. In this presentation the fundamental limits and the trade-offs between the physical size of an antenna and its gain‚ efficiency and bandwidth are examined. Finally‚ we examine the difficulty experienced in determining the physical
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An allure for Science and Technology and a keen interest in the growing world of technology led me to take up engineering. I chose to major in Electrical and Electronics Engineering with an intense longing to explore into the challenging field. During my under graduate program I learned the different fundamentals of electrical and electronics which were well-balanced with practical exposure. Right from my school days I had an active interest for science and research. As a matter of fact‚ I used to
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Chapter 1 Principles of Electricity Practice Problems 1. One coulomb of charge passes a point every 20 seconds. Calculate the value of the current through the point. I = Q/t = 1 coulomb/20 seconds = 0.05C/s = 0.05 A 2. A total charge of 2.5x10^-3 C passes a point every 40 seconds. Calculate the value of the current through the point. I=Q/t = 2.5C/40s = 0.0625C/s = 0.0625 A 4. A total charge of 50x10^-3 C passes a point every 2.5 seconds. Calculate the
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Dependent Resistors Light Dependent Resistors (LDR) are also called photoresistors. They are made of high resistance semiconductor material. When light hits the device‚ the photons give electrons energy. This makes them jump into the conductive band and thereby conduct electricity. A photoresistor or light-dependent resistor (LDR) or photocell is a light-controlled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity; in other words‚ it exhibits photoconductivity
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circuit elements around the chosen loop. The figure contains two junctions (where three or more wires meet)--they are at the ends of the resistor labeled R3 . The battery supplies a constant voltage Vb ‚ and the resistors are labeled with their resistances. The ammeters are ideal meters that read I1 and I2 respectively. The direction of each loop and the direction of each current arrow that you draw on your own circuits are arbitrary. Just assign voltage drops consistently and sum both voltage drops
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stationary‚ there is no back e.m.f. in the armature. Consequently‚ if the motor is directly switched on to the mains‚ the armature will draw a heavy current (Ia = V/Ra) because of small armature resistance. As an example‚ 5 H.P.‚ 220 V shunt motor has a full-load current of 20 A and an armature resistance of about 0.5 . If this motor is directly switched on to supply‚ it would take an armature current of 220/0.5 = 440 A which is 22 times the full-load current. This high starting current may result
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remain constant: I∞V Exactly how much current flows in a wire depends not only on the voltage‚ but also on the resistance the wire offers to the flow of electrons. Electrons are showed down because of interactions with the atoms of the wire. The higher the resistance‚ the less the current for a given voltage V. Resistance is defined as; Where R is the resistance of a wire or any other device‚ V is the potential difference across the device and I is the current that flows through
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conductance and resistance? They are the reciprocals of one another. 2. What is the symbol for mhos? ______upside down omega sign (Ω)___ 3. What other unit‚ other than mhos‚ can conductance be measured in? What is its symbol? Siemens‚ S 4. What is the total resistance of a circuit with three parallel resistors with the values below? Gt= G1+G2+G3= 0.5mS+0.25mS+0.75mS= 0.0015 x 10^-3= 1.5mS Rt= 1/Gt= 1/1.5mS= 667Ω 5. Use the reciprocal method to calculate the total resistance of the circuit
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