TechLab: Capacitor Variations varying the parameters in an RC circuit
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- Coral Tate
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1 TechLab: apacitor ariations varying the parameters in an circuit PIO D G O U P Purpose In this activity, you will investigate the effects of varying the parameters of a resistor-capacitor () circuit. pparatus F capacitors 2 mini bulbs in sockets [6.3 ] 2 - or D-cell batteries 2 more - or D-cells or one 6 battery 3 battery connectors (optional) single throw double pole switch connecting wires computer data analysis software (Datatudio) interface device (UB Link) current/voltage sensor et Up 1. Turn on the computer and set it aside. 2. onnect the circuit shown. Note: the switch is in an open (up) position during circuit construction. 3. onnect the current/voltage sensor so that it measures the current through the capacitor and the voltage across the capacitor. Pay attention to the polarity of the battery set. onnect the voltmeter leads so that the voltage will read positive when the switch is closed in position 1. onnect the ammeter leads so that the current will read positive when the switch is closed in position onnect the current/voltage sensor to the interface device. 5. onnect the interface device to the computer. 6. When the computer detects the sensor and asks what you would like to do, select Open ctivity: 2.07 apacitor ariations. 8. Make certain the capacitor is discharged by touching opposite ends of a wire to both terminals of the capacitor for a few seconds. The Book of Phyz Dean Baird. ll rights reserved.
![3 ] 2 - or D-cell batteries 2 more - or D-cells or one 6 battery 3 battery connectors (optional) single throw double pole switch connecting wires computer data analysis software (Datatudio) interface](/docs-images/41/22536610/images/page_1.jpg "device (UB Link) current/voltage sensor et Up 1. Turn on the computer and set it aside. 2. onnect the circuit shown. Note: the switch is in an open (up) position during circuit construction. 3.")
2 Procedure PT. Y TH POTNTIL (OLTG) 1. Observe the charging of the capacitor in the standard circuit while recording the current, voltage, and power. a. lick the on-screen "start" button to activate data sampling. The software has been configured to start b. lose the switch to position 1 and observe the charging of the capacitor for 100 seconds. The software has been configured to terminate data sampling after 100 seconds. If the sampling does not start when you close the switch, open the switch. everse the ammeter connections, then close the switch in position 2 to discharge the capacitor. top data sampling and repeat, starting from step a above. c. lose the switch to position 2 to discharge the capacitor. 2. Double the potential of the battery by adding two more - or D-cells in series or by replacing the two batteries with one 6 battery. Observe the charging of the capacitor in the double-potential circuit while recording the current, voltage, and power. a. lick the on-screen "start" button to activate data sampling. The software has been configured to start b. lose the switch to position 1 and observe the charging of the capacitor for 100 seconds. The software has been configured to terminate data sampling after 100 seconds. If the sampling does not start when you close the switch, open the switch. everse the ammeter connections, then close the switch in position 2 to discharge the capacitor. top data sampling and repeat, starting from step a above. c. lose the switch to position 2 to discharge the capacitor. 3. What differences if any are apparent when the charging potential is approximately doubled? Which measurements if any don't seem to be significantly different? Discuss each measurement with respect to time as well. a. oltage. b. urrent. c. harge. d. nergy stored. The Book of Phyz Dean Baird. ll rights reserved.
3 PT B. Y TH ITN 1. Double the resistance by adding a second bulb in series with the original. Observe the charging of the capacitor in the double-resistance circuit while recording the current, voltage, and power. a. lick the on-screen "start" button to activate data sampling. The software has been configured to start b. lose the switch to position 1 and observe the charging of the capacitor for 100 seconds. The software has been configured to terminate data sampling after 100 seconds. c. lose the switch to position 2 to discharge the capacitor. 2. What differences if any are apparent when the resistance is approximately doubled? emember you're comparing this circuit to the original circuit in part.1. different? Discuss each measurement with respect to time as well. a. oltage. b. urrent. c. harge. d. nergy stored. The Book of Phyz Dean Baird. ll rights reserved.
4 PT. Y TH PITN 1. Two capacitors in series. onnect two capacitors in series. Measure the voltage across the entire combination. Observe the charging of the capacitor in the series capacitor circuit while recording the current, voltage, and power. a. lick the on-screen "start" button to activate data sampling. b. lose the switch to position 1 and observe the charging of the capacitor for 100 seconds. c. lose the switch to position 2 to discharge the capacitor. 2. What differences if any are apparent when a single capacitor is replaced by two capacitors connected in series? different? Discuss each measurement with respect to time as well. a. oltage. b. urrent. c. harge. d. nergy stored. 3. Two capacitors in parallel. onnect two capacitors in parallel. Observe the charging of the capacitor in the parallel capacitor circuit while recording the current, voltage, and power. a. lick the on-screen "start" button to activate data sampling. b. lose the switch to position 1 and observe the charging of the capacitor for 100 seconds. c. lose the switch to position 2 to discharge the capacitor. 4. What differences if any are apparent when a single capacitor is replaced by two capcitors connected in parallel? different? Discuss each measurement with respect to time as well. a. oltage. b. urrent. c. harge. d. nergy stored. The Book of Phyz Dean Baird. ll rights reserved.
5 nalysis 1. Use maximum potential and charge values to determine the effective capacitance of the a. series capacitors. b. parallel capacitors. 2. How should capacitors be connected to produce maximum capacitance? eries Parallel Post Lab Questions 1. What would happen if the circuit were connected with no resistor a. during the charging process? b. during the discharge process? 2. What values of potential, resistance, and capacitance yield the greatest storage of charge (separated in the capacitor)? a. Potential: High Low doesn't matter. b. esistance: High Low doesn't matter. c. apacitance: High Low doesn't matter. 3. What values of potential, resistance, and capacitance yield the greatest storage of energy? a. Potential: High Low doesn't matter. b. esistance: High Low doesn't matter. c. apacitance: High Low doesn't matter. 4. onsider the potential vs. time plots for four identical capacitors in circuits during the charging process. If curve represents a capacitor connected in series to a resistor of resistance and a battery with a potential, a. what are the characteristics of the circuit depicted in curve? b. what are the characteristics of the circuit depicted in curve B? B c. what are the characteristics of the circuit depicted in curve? The Book of Phyz Dean Baird. ll rights reserved.
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