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Lecture%2030%202220%20Spring%202009

Lecture%2030%202220%20Spring%202009 - Reminders and...

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1 Reminders and Announcements HW 18 is due Friday; HW 19 will be due next Tuesday • Help Room Hours (Physics 117): Help Room Hours (Physics 117): – M 4-8 pm, T 3-6:30, W 3-6:30, R 4:30-8, F 2-6 Power as a Function of Frequency Power can be expressed as a function of frequency in an RLC circuit ( ) This shows that at resonance, the average power is a maximum ( ) 2 2 2 2 2 2 2 2 rms av o V R ω P R ω L ω ω Δ = + Quality Factor The sharpness of the resonance curve is usually described by a dimensionless parameter known as the quality factor , Q parameter known as the , Q = ω o / Δ ω = ( ω o L ) / R Quality Factor, cont. A high- Q circuit responds only to a narrow range of frequencies Narrow peak A low- Q circuit can detect a much broader range of frequencies Typical Q values in electronics range from 10 to 100 Transformers • An AC transformer consists of two coils of wire wound around a core of soft iron The side connected to the input AC voltage source is called the primary and has N
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