Lecture 11 Electromagnetic Oscillations andAlternating Current Chp. 31• Warm-up problem• Topics– Transformers– LC Circuit Qualitatively– Electrical and Magnetic energy oscillations– Alternating current– Pure R and L circuits– Series RLC circuit– Power and Transformers• DemosdAnBmˆ!=•!"AdB!!!=dAB!cos=!nˆB != "d#dt= "d(BA cos$)dt= "BAd cos$dt= BA sin$d$dt= BA%sin$ but $=%t so d$dt=% != BA"sin"t !=!msin"tWhere " is the rotational angular frequency of the generator"= 2#f and f= 60 HzAxis of rotationCoil of wireDriven RLC Series Circuit1.0 uF4.25 mHf =16.28 LC=16.28 4.25 ! 10"3H ! 10"6Ff = 2445HzDemonstrationSeries LCR circuitP=Irms2REffective PowerIrms=I2rms=root-mean-squarePeak
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