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PY208N-Lecture-26

# PY208N-Lecture-26 - Physics 208N-004 Lecture#26 23 March...

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1 Physics 208N-004 Lecture #26 – 23 March 2011 Chapter 31: 3-10 Electromagnetic waves , 32: 4 Refraction Complete Chapter 30 and Review Inductor Inductive Reactance Capacitor Therefore, the current through an inductor lags the voltage by 90°. Therefore, in a capacitor, the current leads the voltage by 90°. Capacitive Reactance Resistor V o = I o [1/( C ) Voltage and current are in phase Analyzing the LRC series AC circuit is complicated, as the voltages are not in phase – this means we cannot simply add them. Furthermore, the reactances depend on the frequency. 30-8 LRC Series AC Circuit We calculate the voltage (and current) using what are called phasors – these are vectors representing the individual voltages.

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2 Here, at t = 0, the current and voltage are both at a maximum. As time goes on, the phasors will rotate counterclockwise. 30-8 LRC Series AC Circuit Some time t later, the phasors have rotated. The voltages across each device are given by the x component of each, and the current by its x component.
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PY208N-Lecture-26 - Physics 208N-004 Lecture#26 23 March...

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