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Unformatted text preview: on the volts/div scale. F= (1/(length of the period*(sec/div))) Lab Activity 3: Using the oscilloscope to analyze a series RLC circuit Q3. Using an Excel spreadsheet, plot the voltage amplitude versus frequency. Include a printout of the graph with your lab report. Q4. At approximately what frequency is the voltage amplitude a maximum? (Again, this is known as the "resonant frequency" of the circuit.) Resonant frequency : 90 Hz Q5. We saw in the introduction that the impedance Z is a minimum at this particular "resonant" frequency. Based on the expression for the impedance Z in Eq. 3 and the condition described above, derive a relationship between the resonant angular frequency ω , the capacitance C, and the inductance L . Be sure to show how you arrived at your result. Impedance at a minimum means that X 1 = X c wL= 1/wc w = 1/sqrt(Lc) Use this relationship and the value of C = 100 μF to deduce the value of the inductance L . W=2piF=1/sqrt(100E-6*L) L= .03127 H...
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This note was uploaded on 05/01/2010 for the course EMCH 211 taught by Professor Ventsel during the Spring '06 term at Pennsylvania State University, University Park.
- Spring '06