Physics 241 Lab: RLC Circuit â AC Source

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7.7. Comparing theory and observation: Use your results from 7.6 along with your observed sourcevoltage amplitude to theoretically calculate the voltage amplitudes of the resistor, inductor andcapacitor in SI units. Then compare each of these theoretically computed amplitudes to yourobservations in 7.1. Your calculations, theoretical results and comparisons:7.8. Since P resistor I V resistor V resistor 2, the power converted to heat by the resistor oscillates inRtime as a squared sine function. The average value of a squared sine function over a complete2 oscillation cycle is averagesin( drivet 2 1 2 . This means P resistor 1 V resistor amplitude. Use this formula toaverage 2 Rfind the average power loss of your circuit in SI units. Your answer:7.9. When the driving frequency is at resonance, the voltages of the source and resistor are equaland in phase. Use this fact to search the range of driving frequencies for the resonant drivingfrequency using the technique described in part 6 of this lab. Compare this observed value to yourpredicted value in 7.6. Your observed resonant frequency and comparison:7.10. Collect data in order to make the graph ofI amplitudevs. f drive . A poor example is shown with a largeresistance is shown. Collect your data below andconstruct your graph on graph paper now:
Section 8: (Open-ended question / creative lab design)Pretend that you are an old-timey inventor. You have alreadydiscovered the coiled wire device (now called inductor) and the metallicparallel plates device (now called capacitor). Resistors were discoveredby a competitor of yours. It is still a sore subject around the workshop.You have begun to combine these new components together inorder to observe their compound behavior. You already found that whenthe inductor and capacitor are combined in series and driven sinusoidally,the circuit produces a special resonant frequency where the current in thecircuit is a maximum. This means that civilization can now makeelectronics that “select” specific driving frequencies and “suppress”frequencies far from resonance.You should try to find the behavior of the current through the circuit for various drivingfrequencies. Try to deduce why this circuit may be said to have an “antiresonant frequency” and seeif you can find it.Now you try combining the inductor and capacitor in parallel and drive them sinusoidally (seefigure). What electrical possibilities might this new compound device hold for the future of mankind?Well, use your anachronistic oscilloscope to find out.At the following prompts, design an experiment to find the behavior of a parallel <strong>RLC</strong> circuitthat is sinusoidally driven. Then implement your experiment and record your observations. You may“cheat” by talking to other groups for ideas, but not “cheat” by already knowing the answer or lookingit up.Your planned experiment, sketch of actual implementation and any theoretical calculations:Your observations:Your explanations & conclusion:I, the physics <strong>241</strong> laboratory TA, have examined this worksheet and found it to be thoroughlycompleted excepting any sections that I have marked herein. TA signature: ____________________
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Physics 241 Lab: RLC Circuit â AC Source