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Unformatted text preview: PHY 132: Abstract: This lab shows that a carbon resistor is ohmic, a light bulb is not. It also uses various lengths of a graphite rod to measure the resistivity of the rod. Objective: The objective of this lab is to better understand electrical resistance, as well as resistivity. Procedure: First, set up a circuit, using a voltmeter and an ammeter, as described in the lab. While tabulating in the range of 0-15volts, take data of ten points while increasing the voltage, and then decreasing, using the same voltage on the way up and the way down. Second, use a light bulb in the circuit. Take measurements again, in the range of 0-6.5 volts, this time taking twenty readings, ten increasing the voltage and then the same ten decreasing. Lastly, use a rod, and alligator clips to include the rod in the circuit. Use 5 different lengths of separation of the clips. 5 voltages should be used for each 5 lengths....
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- Spring '08