Experiment 8 - Capacitance and the Oscilloscope

# Experiment 8 - Capacitance and the Oscilloscope -...

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Capacitance and the Oscilloscope Experiment #8 Jae Chung 12/3/2007

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Intro: In this experiment, we measured the change in current from charging and discharging RC circuits with different capacitance levels in order find their time constants. The time constant of charging is 5.976 ± 0.083s for 10μF; 11.485 ± 0.106s for 20μF; and 17.458 ± 0.147s for 30μF. The time constant for discharging is 6.300 ± 0.110s for 10μF; 12.012 ± 0.190s for 20μF; and 18.030 ± 0.232s for 30μF. The mean resistance is (5.846 ± 0.062) x 10 5 Ω for charging and (6.105 ± 0.094) x 10 5 Ω for discharging. Procedure: First, we set up the capacitors, switch, power supply, and resistors in a circuit as illustrated above. We set the power supply to 15V and capacitance level to 10μF. We took measurements by simultaneously flipping the switch to connect the capacitor in series with the battery and starting a stopwatch. As charging began, we recorded the current displayed on the ammeter in increments of 2 seconds. We repeated this for three trials. Afterward, we repeated the procedure for capacitance levels of 20μF and 30μF. For the second part of the experiment, we attached a second ammeter where the resistor was in the initial setup. To begin the experiment, we charged the capacitor at 10μF. We know that the capacitor is fully charged and ready to be discharged when there is no current running through it in the series circuit. At this point, we flipped the switch to the other side to begin discharging the capacitor across the ammeter resistor while simultaneously
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## This lab report was uploaded on 04/07/2008 for the course PHYS 1493 taught by Professor Lab during the Fall '08 term at Columbia.

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Experiment 8 - Capacitance and the Oscilloscope -...

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