# L11 - potential difference across it. The independent...

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Matching Table Part A Math Maps to Physics Value (graph) Value (expected) Units y ------------> I Variable Variable mA m ------------> R 1.026 0.982 mA/V x ------------> V Variable Variable V b ------------> I0 -0.1055 0 mA I = (1.026 mA/V)*( V ) – 0.1055 mA Part B Math Maps to Physics Value (graph) Value (expected) Units y ------------> I Variable Variable mA m ------------> V 5756 5900 mA* Ω x ------------> 1/R Variable Variable 1/Ω b ------------> 0.030 0 mA I = (5756 mA* Ω)*( 1/R ) + 0.030 mA Experimental Error Part A % error = 100 * |measured value – expected value|/(expected value) % error = 100 * |1.026 mA/V – 0.982 mA/V|/(0.982 mA/V) % error = 4.48% Part B % error = 100 * |measured value – expected value|/(expected value) % error = 100 * |5756 V – 5900 V|/(5900 V) % error = 2.44% Conclusion The goal of the lab was to determine the relationship between a) current and potential difference, and b) current and resistance for simple resistors. For this lab I used resistors between 500 and 10,000 ohms. In part A, I determined the relationship between the current in a resistor and the
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Unformatted text preview: potential difference across it. The independent variable is the battery voltage and the dependent value is the current. The slope of the graph was 1.026 mA/V, which is supposed to be the resistance of the resistor. This is because according to Ohms law, V/I=R. My value was 4.48% off from the expected value I measured in the beginning, which is 982 ohms of .982 mA/V. In part B, I determined the relationship between the current in a resistor and the value of the resistance. The independent variable is the reciprocal of the resistance and the dependent value is current. By graphing the values I found, the slope is 5756 mA*, which is the potential difference across the battery. This is because by rearranging Ohms Law, V=IR. My measured was 2.44% off from the measured value of the four batteries, which was 5.90 V or 5900kV. From this lab I learned that the circuit obeys Ohms Law....
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## This note was uploaded on 09/07/2011 for the course PHYSICS 101 taught by Professor Graham during the Spring '11 term at UNC.

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