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Unformatted text preview: AC Circuits Experiment #9 Jae Chung 12/10/2007 I ntro: In this lab, we measured AC voltages with various levels of resistances and frequencies to find a resonance frequency. We used driving frequencies from an RLC circuit to calculate our time and phase differences. For our results, we measured a resonance frequency of 3651.48 ± 125.66 rad/s. With the RLC setup, we measured a FWHM phase difference of 7608.94 ± 30 rad/s at 10 , 7100.32 ± 100 rad/s at 50 , and 11498.23 ± 200 rad/s at 500 . Ω Ω Ω Our copper ring induction was 25.27 ± 0.53 mH. Our measured phase shift at high frequency of the inductor is 1.53 ± .095 rad, and at low frequency is 1.312 ± .153 rad. The phase difference in our driving voltage and the theoretical values are: frequency (Hz) phase difference (rad) theoretical value (rad) 3231.17± .091.53 433.599± 0.0231.48 863 .651± 0.056 1.393 1153 .942± 0.075 1.534 1710 1.203± .110 1.550 Procedure: First, we set up the oscilloscope, function generator, variable resistor box, 0.5 F capacitor, μ and 150mH inductor in a circuit such that channel 1 displayed the sinusoidal wave function generator and channel 2 displayed the voltage across the resistor. We recorded the voltage amplitude and frequency for 10 t rials below and 10 t rials above resonance frequency at the largest peak to peak voltage across the resistor. We repeated the above steps for resistances of 10 and 500 . Ω Ω Next, we inserted a copper ring with an inductance of 25.5m H in place of the previous inductor. Then, we searched for the resonance frequency. After doing this, we went back to our original RLC set up but with the variable resistor set at 30 . We measured 5 Ω frequencies of the funct ion generator to find the difference between the driving voltage...
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This lab report was uploaded on 04/07/2008 for the course PHYS 1493 taught by Professor Lab during the Fall '08 term at Columbia.
 Fall '08
 LAB
 Resistance

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