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# Lab #9 - 4 The phase is 2.01 5 The phase of the inductor is...

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Marc Pomi 106040098 4/20/09 Physics 134 Lab Recitation 1 (12:50-2:50) Lab #9 Resonance Abstract: In this experiment, we observe the response of a series LCR circuit when it is driven by a voltage whose frequency can be adjusted. Procedure: 1. Connect the circuit as provided in the diagram. Set the resistance to 50 and the capacitance to 0.1 μ F. 2. Adjust frequency so the voltage is across the resistor is maximum. 3. Interchange the resistor and capacitor to measure voltage across the capacitor. 4. Interchange the capacitor and inductor to measure voltage across the inductor. 5. Reconnect the circuit as provided in the second diagram. 6. Reconnect the circuit as provided in the third diagram. 7. Set the resistance to 50 and capacitance 0.1 μ F. 8. Repeat the above procedure with R = 10 and C = 0.1 μ F. Questions: 1. The frequency where resonance should occur is 8 kHz. 2. The phase is 2.01 3. The amplitude is 9V at resonance which is higher then the input voltage.

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Unformatted text preview: 4. The phase is 2.01 5. The phase of the inductor is the same as the capacitor. 6. The amplitude is 9v which is the same. 7. The capacitor and inductor are in phase as opposed to the input voltage which is out of phase. 8. The input voltage is 0.22V and the L-C voltage is 0.2. The L-C is out of phase and in the input voltage is in phase. 9. 10. Results: 50 Ω 0.1 µF 10Ω 0.1 µF Frequency (Hz) Voltage(Volts) Frequency(Hz) Voltage(Volts) 5500 0.28 5500 0.1 6500 0.48 6500 0.15 7500 0.76 7400 0.34 8500 0.68 8500 0.36 9600 0.48 9500 0.16 10600 0.36 10500 0.11 11600 0.36 11500 0.1 13100 0.28 12500 0.09 Conclusion: Using several frequencies above and below resonance we were able to find the resonance curve which led us to see the ability of an in phase voltage is higher than the input voltage. Some sources of error included old faulty equipment as well as oscillating oscilloscope counter....
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