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Physics 145 Introduction to Experimental Physics I Instructor: Karine Chesnel Office: N319 ESC Tel: 801- 422-5687 kchesnel@byu.edu Office hours: on appointment Class website: http://www.physics.byu.edu/faculty/chesnel/physics145.aspx

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Your lab assignments 1.Prepare by reading the introduction material 2.Answer quiz questions (within the first half hour) and submit the sheet to your TA 3.Proceed to the experiments 4.Write a report of your findings for each experiment, in your lab notebook (individual reports)

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Lab 7-9 LRC circuits

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Impedances (see Lab 6) Resistor VRVR I Inductor VLVL I Capacitor VCVC I In AC mode:

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AC Impedances Circuit in series: add impedances

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AC Gain “Gain” = output / input V in V out RLC circuit RC circuit V in V out RL circuit V in V out

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Low-pass and high-pass filters RC circuit V in V out Frequency response High-pass Cutoff frequency RL circuit V in V out Frequency response Low-pass Cutoff frequency

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Time responses RL circuit V in V out When RC circuit V in V out Response time When Response time

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Resonator V in V out RLC circuit Resonance frequency Resonance Band-pass filter width Behavior of phase

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AC Impedances Circuit in parallel: add inverses of impedances Notch filter Frequency (Hz)

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Lab 7: AC impedance & high-pass filter A. Theory and calculation for RC filter L7.1: Compute impedance Z, phase and gain G L7.2: Check analytical results (Mathematica) L7.3: Design RC filter with f 0 ~ 1 - 5kHz B. Measurements L7. 4, 5: set up the RC circuit L7.6: measure gain G versus frequency f L7.7: Plot G(f) and fit L7.8: Behavior of phase

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Lab 8: Low-pass & high-pass filters A. Frequency response for RL filter L8.1: Design a RL filter L8.2: Set up the RL circuit L8.3: Measure gain G versus frequency f, plot and fit L8.4: compare experiment to theory B. Time response for RL filter L8.5: response on a square-wave, measure t RL B. Time response for RC filter L8.6: response on a square-wave, measure t RC, compare

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Lab 9: RLC resonator A. Measure & analyze RLC resonator L9. 1: Design RLC series circuit for various f 0 ~ 100Hz L9.2: Set up the RLC circuit L9.3: Measure gain G versus frequency f, plot and fit L9.4: Compare experiment to theory L9.5: Behavior of phase L9.6: Behavior of Z, current I and gain value at resonance B. Parallel RLC circuit – notch filter L9.7: Measure gain G versus frequency f, hole width C. Rms quantities and power dissipation L9.8: measure V rms, I rms and P, feel heating through resistor

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