102lect14_handout

102lect14_handout - Physics 102: Lecture 14 Electromagnetic...

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Physics 102: Lecture 14, Slide 1 Electromagnetic Waves Physics 102: Lecture 14
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Physics 102: Lecture 14, Slide 2 • At resonance – Z is minimum (=R) –I max is maximum (=V gen,max /R) –V gen is in phase with I –X L = X C V L (t) = -V C (t) • At lower frequencies –X C > X L V gen lags I • At higher frequencies –X C < X L V gen lead I I max (X L -X C ) I max X L I max X C I max R φ
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Physics 102: Lecture 14, Slide 3 Preflight 14.1 As the frequency of the circuit is either raised above or lowered below the resonant frequency, the impedance of the circuit: Always increases Resonance in AC Circuits frequency Only increases for lowering the frequency Only increases for raising the frequency f 0 Z L R C
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Physics 102: Lecture 14, Slide 4 Preflight 14.3 At the resonant frequency, which of the following is true? I is in phase with V generator I leads V generator I lags V generator V L V C V R φ = 0
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Physics 102: Lecture 14, Slide 5 What is it good for? • Current through circuit depends on frequency (maximum at resonance frequency f o ) – Radio receiver – Stereo equalizer – NMR/MRI L R C
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Physics 102: Lecture 14, Slide 6 Resonance in Radios An AC circuit with R= 2 Ω , L = 0.30 μ H and variable capacitance is connected to an antenna to receive radio signals at the resonance frequency.
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102lect14_handout - Physics 102: Lecture 14 Electromagnetic...

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