PHY lab six

PHY lab six - PHY-132 Capacitors- Lab 6 Joshua Manski...

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PHY-132 Capacitors- Lab 6 Joshua Manski Partners: Sandra Thoms, Gavin King Date: October 9 th 2008 SLN# 82129, Thursday 12:00pm Brian Morrison Objectives : In this lab we examined various capacitors and how they react to voltage/charges. By using a charge sharing technique we were able to determine the capacitance of unknown capacitors. The properties of dielectrics were lightly examined while constructing parallel plate capacitors. We also explored various techniques for measuring the voltages across capacitors. Experimental Procedure : To start this lab we first needed to understand how to measure voltage across a capacitor. To accomplish this we set up a simple experiment allowing us to try and measure a capacitor’s voltage.
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For the introduction we mounted a capacitor in a Styrofoam block then charged it with a voltage source. We then directly measured the voltage across it using a DMM and noted the results. Then we mounted the same capacitor (now discharged) across the voltage follower and connected the DMM to the output of the follower. We charged the capacitor and noted the voltage that was read on the DMM. While the capacitor was still on the voltage follower we shorted it using an alligator clip and noted the results from the DMM. After completing the above steps we began the formal experiment. Part 1 To start the experiment we connected a 0.1 µF capacitor across the voltage follower and mounted a 1 µF capacitor in the Styrofoam block that was then connected in parallel with the 0.1 µF capacitor. We then made sure that the resulting 1.1 µF capacitor was completely discharged. We then charged a second 1µF capacitor with the 5V source by inserting the two ends of the capacitor into the DC source. After the 1 µF was charged we touched it across the 1.1 µF capacitor keeping polarity in mind. After the 1 µF capacitor shared its charge we discharged it by touching an alligator clip across the leads. We then noted the resulting voltage across the 1.1 µF capacitor by using the DMM that was still connected to the output of the voltage follower. Part 2 In this part we discharged the 1.1 µF capacitor that was used in the previous task. Then we repeated the Part 1 steps using a 0.1 µF capacitor as the charge transfer capacitor. We again noted the voltage using the DMM. We then charged the 0.1 µF capacitor to 5 volts again and transferred the charge to the 1.1 µF capacitor without discharging the 1.1 µF capacitor. We noted the resulting voltage across the 1.1 µF capacitor and for the third time transferred the charge from a fully charged 0.1 µF capacitor to the un-discharged 1.1 µF capacitor.
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Part 3 For this task we fully charged the 1.1 µF capacitor to 5 V and shared this charge with an unknown capacitor that was given to us. From the voltage that was left on the 1.1 µF capacitor we were able to determine the measured capacitance of the unknown capacitor. To check our calculation we set the DMM to read capacitance and measured the actual capacitance of the
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PHY lab six - PHY-132 Capacitors- Lab 6 Joshua Manski...

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