lecture23 - 11.2-11.3 Electric Power Distribution,11.2-11.3...

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Unformatted text preview: 11.2-11.3 Electric Power Distribution,11.2-11.3 Electric Power Distribution,Generators and MotorsGenerators and MotorsNew ideas for todayNew ideas for today•Magnetic induction•Lenz’s law•Transformers and power transmission•Motors and GeneratorsWhy such high voltage?Why such high voltage?Transformers!Transformers!Observations about PowerObservations about PowerDistributionDistributionHousehold power is AC (alternating current)Power comes in voltages like 120V & 240VPower is transmitted at “high voltage”Power transformers are everywherePower Consumption in wiresPower Consumption in wiresReminder:power consumption = current ×voltage dropvoltage = resistance ×currentpower consumption = resistance ×current2So what?Wires waste power as heatDoubling current quadruples wasted powerBetter not transmit high current!DCACEdisonTeslaWestinghousevs.vs.AC = alternating currentAC = alternating currentCurrent switches direction 60 timesper second (in N. America)DC= “direct current”AC Power Transmission...
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This note was uploaded on 04/10/2008 for the course PHYS 140 taught by Professor Perdekamp/pitts during the Spring '08 term at University of Illinois at Urbana–Champaign.

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lecture23 - 11.2-11.3 Electric Power Distribution,11.2-11.3...

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