The Sustainability of Experience — Investing in the Human Factor 28th Annual USSD Conference Portland‚ Oregon‚ April 28 - May 2‚ 2008 Hosted by Portland General Electric On the Cover Portland General Electric’s North Fork Dam‚ on the Clackamas River southeast of Portland‚ is a thin‚ variable-radius concrete arch dam with a maximum height of 207 feet and a thickness varying from 32 feet at the base to 8 feet at the crest. The spillway is a 200-foot-long gated ogee-type structure with
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5 000 000 V? 3. An electric motor is developing 8.5kW at a speed of 900r/min. Calculate the torque available at the shaft. 4. A generating station has a daily output of 160MW h and uses 300 t (tones) of coal in the process. The coal releases 7 MJ/kg when burnt. Calculate the overall efficiency of the station. 5. A lift of 250 kg mass is raised with a velocity of 6 m/s. If the driving motor has an efficiency of 85%‚ calculate the input power to the motor. 6. An electric heater contains 70 liters
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and the right general idea. One afternoon Hans Christian Oersted was attempting to demonstrate to his students that moving charges did not make a magnetic field. Oersted had planned to demonstrate this by showing the heating of a wire by an electric current. He also wanted to demonstrate magnetism. In order to do this‚ he provided a compass needle mounted on a wooden stand. Oersted noticed that every time the
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PROJECT IN T.L.E Electronic Components Diodes a diode is a two-terminal electronic component with asymmetric conductance‚ it has low (ideally zero) resistance to current flow in one direction‚ and high (ideally infinite) resistance in the other. A semiconductor diode‚ the most common type today‚ is a crystalline piece of semiconductor material with a p–n junction connected to two electrical terminals. A vacuum tube diode has two electrodes‚ a plate (anode)
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Temperature 5 Components of Electrical Circuits 6 Components of an Electric Circuit 7 Measuring Current‚ Voltage and Resistance 8 Measuring voltage 8 Measuring current 9 Measuring resistance 9 Ohm’s Law‚ Electricity 10 Definition of Ohm 11 Unit of resistance is ’ohm’ 11 Statement of Ohm’s Law 11 Ohm’s law : Current 13 Ohm’s Law : Voltage 13 Ohm’s Law : Resistance 13 Ohm’s Law : Formula Transformation 14 Electric Power and Its Derivation 15 DC POWER: DC Power V and I. 15
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D cell batteries (1.5 volts DC) and a wall socket (120 volts AC). • Current - is the flow of electrons. It is measured in amperes. • Resistance (ohms‚ Ω) is the ability to oppose an electrical current. PHYS 401 Physics of Ham Radio 26 PHYS 401 Physics of Ham Radio 27 Circuit Definitions A circuit must close to be complete! PHYS 401 Physics of Ham Radio 28 Ohm’s Law • Ohm’s Law relates Current (I)‚ Voltage (E) and Resistance (R) • The relationship can be written
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AIM TO STUDY THE VARIATION OF CONDUCTANCE WITH CHANGE IN DISTANCE‚MOLARITY AND TEMPRATURE. CERTIFICATE I have the pleasure to certify that RAGHUVANSH SINGH BHALLA student of class XII (Science) of J.D. Tytler School has persuade his work and prepared the dissertation on the topic. To study the variation of conductance with change in distance‚ molarity and temperature . Under my supervision and guidance‚ this is being submitted for
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Electric cars‚ although now commonly associated with the Tesla brand‚ have in actuality been around for more than 100 years and have since then risen and fallen in popularity and efficiency. The electric vehicle was created initially to replace the inefficient steam and gasoline-powered vehicles of the 20th century‚ however‚ as the years progressed and the dangers of global warming and greenhouse gas became more evident‚ the purpose of the electric car transitioned into providing a better alternative
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MHD is attractive because it offers a propulsion system that requires no moving parts. It works on a principle similar to that of an electric motor or generator; that is‚ passing an electrical current through a magnetic field creates a force. In an MHD propulsion system‚ a magnetic field is created within the hull‚ and sea water is used to conduct the electric current‚ as shown in the illustrations accompanying this story. The underlying principle is known as Fleming’s Left-Hand Rule‚ which is demonstrated
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Ten years ago our electric motor business was in real trouble. Low labor rates allowed the Eastern Bloc countries to sell standard motors at prices we were unable to match. We had become the high-cost producer in the industry. Consequently‚ we decided to change our strategy and become a specialty motor producer. Once we adopted our new strategy‚ we discovered that while our existing cost system was adequate for costing standard motors‚ it was giving us inaccurate information when we used it to
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