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Slide 1 Analysis of Resistor-Capacitor Circuits Warning: Only click Save & Go Next to advance to the next slide. Never click on the slide numbers to move forward to the next slide. ©2020,CC BY-NC-SA, Robert DeSerio and Shawn Weatherford, University of Florida
Slide 2 Lab Objectives and Materials Objectives In this experiment, you will build resistor-capacitor circuits and make measurements of the capacitor voltage as it undergoes charging and discharging. Further, you will determine the time constant from the analysis of the transient processes and make predictions for the time to measure a specified voltage. Finally, you will compare predictions for the time constants of capacitors arranged in series or parallel with the data collected with the IOLab. Materials: IOLab 2 3.3 μF capacitors ~100kΩ and ~50kΩ resistors 3 double Fahnestock clips 1 single Fahnestock clip 3 thumb tacks 5 jumper wires corkboard Review the instructions on the background and theory for RC circuits before moving to the next slide.
Slide 3 Construct Apparatus from Circuit Diagram Use the materials listed on the previous slide and the circuit diagram below to construct a circuit containing one capacitor and the ~50kΩ resistor in series using three double Fahnestock clips, the corkboard, and three thumb tacks. Jumper wires will be used to connect the points labeld on the diagram with labeled ports on the IOLab, and the two ends of the circuit to the 3.3V IOLab port and the GND port. On the next slide, you will test your circuit to see if it can charge and discharge your capacitor.
Slide 4 Analog 7 (100 Hz) Remote 1 Time (s) 0 1 2 3 4 5 6 7 8 9 10 A (V) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Analog 8 (100 Hz) Remote 1 Time (s) 0 1 2 3 4 5 6 7 8 9 10 A (V) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Analog 9 (100 Hz) Remote 1 Time (s) 0 1 2 3 4 5 6 7 8 9 10 A (V) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Testing Your RC Circuit Click Record to begin data collection. As it is running, gently pull the end of the hookup wire out from the 3.3V terminal on the IOLab and touch it to a GND terminal on the IOLab to discharge the capacitor. You should see a drop in the voltage reading for A8. Next, connect the free wire back into the 3.3V and observe the voltage measured by A8 return to close to 3.3V. If you see both of these occur, then your circuit is connected as intended.If your IOLab shuts off when you touch the free wire to GND, then most likely you've removed the wrong end of the wire and shorted the circuit. Each run is set to a fixed duration of 10 seconds. You may delete or "Remove" runs you no longer wish to keep. Older runs will be redrawn in a lighter color once a new run commences. Practice charging and discharging your capacitor. You can momentarily pause the recording by clicking the Stop button, then resuming data collection by clicking Continue . When you are comfortable with this procedure, continue to the next slide by clicking Save & Go Next at the bottom of this slide.
Slide 5 Analog 7 (100 Hz) Remote 1 Time (s) 1 2 3 4 5 6 7 8 9 10 A (V) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 ∆t: 0.54945 s μ: 0.0000 V — σ: 0.0 V a: 0.000 Vs s: 0.00 V/s (r²: NaN) Analog 8 (100 Hz) Remote 1 Time (s) 1 2 3 4 5 6 7 8 9 10 A (V) 0 1 2 3 ∆t: 0.54945 s

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