Lab #3 - capacitor after switching Questions 1 Q1 = C1V1 Q2...

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Marc Pomi 106040098 2/16/09 Lab #3 Capacitors Abstract: In this experiment we are using known values of voltages and a multi function capacitor to find the value of an unknown capacitor by wiring the capacitors in parallel and series. Procedure: 1. Connect two capacitors in parallel utilizing the throw switch as well as the battery and oscilloscope according to the figure given. 2. Move the switch to the left to discharge the unknown capacitor and charge the known capacitor. 3. Throw the switch and record the voltage as soon as possible as the voltages decays due to charge flowing out of the capacitor. 4. Repeat steps 2 and 3 for five other known capacitance values. 5. Disconnect the circuit and rewire the capacitors in series with the switch thrown to the left. Set the known capacitor to 5 µF. 6. Throw the switch to the right to figure out the voltage across the unknown capacitor. 7. Repeat steps 6 and 7 to get a good estimate of uncertainty. 8. Reconnect the oscilloscope leads so that you can find the voltage across the known
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Unformatted text preview: capacitor after switching. Questions : 1. Q1 = C1V1; Q2 = C2V2; V0C1= Qtotal; Qtotal = Q1 + Q2; V0C1=C1V1 + C2V2 = CeqV; V1 = V2 = V; V0C1 = V(C1 + C2); V = V0C1/(C1 + C2) 2. Voltage decays because the capacitor is discharging. 3. 4. V1 = V0/C1 +C2 5. No we had faulty equipment. 6. V1 and V2 should equal V0 in series but should be equal in parallel Results: Known Capacitor Value (Parallel) (µF) Voltage Across C1 (V) 1 0.2 ± 0.04 2 0.36 ± 0.04 3 0.48 ± 0.04 4 0.56 ± 0.04 5 0.64 ± 0.04 6 0.72 ± 0.04 Battery Voltage = 1.4 ± 0.1 V Voltage across C1 in series: 0.64 V ± 0.04 Voltage across C2 in series: 0.64 V ± 0.04 Conclusion: Due to unfortunate circumstances and Stony Brooks need to fund landscaping instead of working equipment in laboratories, our experiment failed to give us the unknown capacitance. The equipment was most likely faulty due to the fact our instructor double checked our wiring and the oscilloscope did not read anything as expected....
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Lab #3 - capacitor after switching Questions 1 Q1 = C1V1 Q2...

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