Physics 241 Lab: RC Circuits â AC Source

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Section 2:2.1. Work though an example before beginning. Remember the equations below as you work.V source(t) V sourcesin( Dt ) V R(t) R Vamplitude Zsourcesin( Dt) V C(t) C Vamplitude Z sourcesin Dt amplitude 2 If your circuit has V source 2 Volts, R 10,000 , C 1x10 -7 Farads, and D1,500 radians/sec findamplitudethe following values with correct units. Your answers:X C =Z = =V R,amplitude . =V C,amplitude . =Now examine V R,amplitude + V C,amplitude =Your answer to this previous question adds to more than V source amplitude !!! No, you didn’t make amistake. Since the voltages are out of phase, their maximums do not add together at the sametime.Now let’s try and visualize this circuit’s behavior:Write the functions for V S(t), V R(t) and V C(t) using the numerical solutions to the previous questions.Quickly sketch V R(t) and V C(t) on the oscilloscope screen below using a graphing calculator. Don’tworry about providing the scale of the time axis. Then sketch V R(t) + V C(t) onto the screen using adotted line. This should equal the function V S(t) so check it using your graphing calculator.
Section 3:3.1. Now you will set up the sinusoidally driven <strong>RC</strong>circuit with R 10,000 , and C 1x10 -7 Farads. Set yourfunction generator to create a sin wave with a voltageamplitude of a nice round number like 3 Volts. You maywant to adjust your frequency later, but start at about 400Hz. Set up a middle ground to view the voltage across boththe resistor and the capacitor simultaneously making sureto invert the correct channel (a necessary step when usinga middle ground). Make a sketch on the oscilloscope screenbelow.<strong>Lab</strong>el the signals V R(t) and V C(t) on your sketchExplain which signal is phase shifted to lag by 90 o . Your explanation:Find the amplitudes of each signal by measuring the peak-to-peak voltage of each signal. Yourobservation:Use the labeled values to determine the impedance of your circuit for this driving frequency.Remember Z R 2 2 C. . Your work and answer:
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Page 3: Explain what happens to the current
Page 7 and 8: In an XY plot, if the signal on the
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Physics 241 Lab: RC Circuits â AC Source

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Physics 241 Lab: RC Circuits â AC Source