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PY208N-Lecture-25

# PY208N-Lecture-25 - Physics 208N-004 Lecture#25 21 March...

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1 Physics 208N-004 Lecture #25 – 21 March 2011 Chapter 25: 7 AC and 30: 7-9 – AC Circuits Review LC Circuits and Electromagnetic Oscillations . Loop Rule Harmonic Oscillator Energy LCR Circuit The system will be underdamped for R 2 < 4 L / C , and overdamped for R 2 > 4 L / C . Critical damping will occur when R 2 = 4 L / C . . . Underdamped

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2 Current from a battery flows steadily in one direction (direct current, DC). Current from a power plant varies sinusoidally (alternating current, AC). 25-7 Alternating Current The voltage varies sinusoidally with time: , as does the current: Multiplying the current and the voltage gives the power: 25-7 Alternating Current Usually we are interested in the average power: .