27 - LCR Oscillations

27 - LCR Oscillations - Physics 212 LCR Oscillations...

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Physics 212 Fall 2009 LCR Oscillations 10/30/2009
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Electronic Signal Speed In an AC circuit, electrons are moving back and forth at a frequency . The signal that the electrons receive to change direction comes from the generating station. What is the speed of that signal? a) v = xT , where x is the distance to a given electron and T is the period of oscillation. b) very close to the speed of light c) faster than the speed of light d) the drift velocity of the electrons e) the speed of sound in the metal wire
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Summary V = V 0 sin( ω t ) i = I 0 sin( t + φ ) Applied emf Solve for amplitude I 0 and phase ϕ
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Phasors Vector that rotates about the origin - represents oscillating quantities Two oscillators “in-phase” Two oscillators out of phase by 90 deg I 0 V 0 φ = 90 ° = π 2 rad I 0 V 0 http://www.ngsir.netFrms.com /
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RCL Series Circuit Applied emf Solve for amplitude I 0 and phase ϕ n.b. this is steady-state current, transient currents from start-up have subsided ε = m sin( ω t ) i = I sin( t + φ ) Use the loop rule ( t ) = v R ( t ) + v C ( t ) + v L ( t ) Because of the different reactances of each component, the emf and current may not be in-phase with each other
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This note was uploaded on 10/03/2011 for the course PHYS 212 taught by Professor Tedeschi during the Spring '08 term at South Carolina.

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27 - LCR Oscillations - Physics 212 LCR Oscillations...

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