102lect13_handout - Physics 102 Lecture 13 AC Circuit...

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Physics 102: Lecture 13, Slide 1 AC Circuit Phasors Physics 102: Lecture 13 • I = I max sin(2 π ft) • V R = I max R sin(2 π ft) V R in phase with I • V C = I max X C sin(2 π ft- π/2 ) •V C lags I • V L = I max X L sin(2 π ft+ π/2 ) •V L leads I I t V L V C V R L R C
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Physics 102: Lecture 13, Slide 2 Peak & RMS values in AC Circuits (REVIEW) L R C When asking about RMS or Maximum values relatively simple expressions ܥ ܮ V R, max = I max R V C, max = I max X C V L, max = I max X L
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Physics 102: Lecture 13, Slide 3 Time Dependence in AC Circuits Write down Kirchoff’s Loop Equation: V gen (t) = V L (t) + V R (t) + V C (t) at every instant of time L R C However … V gen,max V L,max +V R,max +V C,max Maximum reached at different times for R, L, C I t V L V C V R We solve this using phasors V gen
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