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Unformatted text preview: cture 20 cture 20 1 LEVITATION ABOVE A SUPERCONDUCTOR cture 20 cture 20 2 2008 by W.H. Freeman and Company cture 20 cture 20 3 READING QUIZ 1 Which of the following statements is incorrect ? A In an A. C. circuit an ideal resistor is a frequency independent component. B At zero frequency the reactance of an ideal capacitor is infinite. C At resonance in a driven series RLC circuit the circulating current has a minimum value. D In an A. C. circuit the inductive reactance of an ideal inductor increases with frequency. cture 20 cture 20 4 Resistive Load Start by considering simple circuits with one element ( R , C , or L ) in addition to the driving emf . Pick a resistor R first. v R (t) and I(t) in phase Kirchhoffs Loop Rule: ( 29 ( 29 ( 29 0 , sin peak t I t R t t  = = ( 29 ( 29 sin R peak peak peak v t I t R t V = = = ( 29 sin peak V I t t R = I peak + I(t) cture 20 cture 20 5 2008 by W.H. Freeman and Company cture 20 cture 20 6 Capacitive Load I(t) leads v(t) by 90 o (1/4 cycle) Loop Rule: ( ) ( ) sin peak q t t C t  = = ( ) ( ) ( ) cos peak dq t d t I t C dt dt C t = = = ( ) ( ) sin peak q t v t t C = = Power: ( 29 ( 29 , , ( ) ( ) ( ) cos sin sin 2 2 peak C peak C peak peak p t I t v t I t V t V I t = = = av P = + cture 20 cture 20 7 2008 by W.H. Freeman and Company cture 20 cture 20 8 Inductive Load v L (t) leads I(t) by 90 o (1/4 cycle) Kirchhoffs Loop Rule: ( ) ( ) 0 ( ) sin peak dI t t L dt t t  = = ( ) ( ) sin L peak dI t v t L t dt = = Power: ( 29 ( 29 , , ( ) ( ) ( ) cos sin sin 2 2 L peak L peak L peak peak p t I t v t I t V t V I t = =  =  av P = ( ) cos peak I t t L =  + cture 20 cture 20 9 2008 by W.H. Freeman and Company cture 20...
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 Fall '08
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