Ohm's Law and Electrical Circuits

Ohm's Law and Electrical Circuits - Abstract In this...

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Abstract In this experiment, we investigated the hypothesis that resistors satisfy Ohm’s law. In part one, an ohmmeter was used to measure the resistance of three resistors separately, in series, and in parallel. In the second part of the experiment, a current was run through the 677 ohm resistor and the current and voltage were both recorded from the multimeters that were hooked up to the circuit. By graphing the current versus the voltage, we were able to determine that the resistor conformed to Ohm’s law. The inverse of the slope of the graph of V vs. I provided another measurement of the resistance, which was derived from the equation V = IR. A similar test was run using a light bulb and it was concluded that the light bulb had a lower resistance than the resistor. The final part of the experiment consisted of setting up a circuit of three resistors, two of which were in parallel. Voltage and current were recorded through each resistor and the results were tested to satisfy each of Kirchhoff’s rules. The equations derived from Kirchhoff’s junction and loop rule held true with the experimentally determined voltages and currents, consistent with the basic theories of circuits. Numerical Results 1. Rt (calculated) for three resistors in series: ____ ohms Rt = R1 + R2 + R3 = 1000 + 715 + 677 = 2392 ohms 2. Uncertainty associated with Rt: _____ ohms Uncertainty for each resistance measurement was 0.5%. The upper and lower bound method shows that Rt uncertainty is the sum of the individual uncertainties of each resistance and therefore equals 1000*0.005 + 715*0.005 + 677*0.005 = 5 + 3.5 + 3.4
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This note was uploaded on 11/27/2011 for the course PHYS 105 taught by Professor Walker during the Fall '08 term at UNC.

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Ohm's Law and Electrical Circuits - Abstract In this...

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