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PHY 132Ohm's LawName: Carlos GazcaPartners: Zachary Kobza, CoreyKhazanovichSection: Group #: 3TA: Tushar9 /13/2016Abstract: The lab covered the principles of resistors and the concept of resistivity. Resistance as seen in the lab is dependent on the length and the cross sectional area of an object. This was seen in part 3 of the lab when the resistivity of the graphite rod was measured. The shortest length was .009m, and the resistance was 4.659 Ohms, for the longest distance (.061m) the resistance was 18.295. This shows the correlation between length and resistivity. Part 1 explored the concept that resistance is proportional to velocity over current. The graph showed that the slope was constant showing that although the voltage increased, so did the current. When the voltage was 5.99V the current was .016 mA, and when the voltage doubled to 12.03V the current was .033mA, like the voltage also doubled. Therefore it allowed for the resistance to remain constant as seen the rate of the slope. Part 2 of the experiment demonstrated that objects have internal resistance, and the light for example the resistance after a certain amount of voltage is applied will go down, and the energy will be converted into heat. The overallconcept of this lab was to understand the fundamentals of Ohm’s law in relation to resistance, voltage, and current.
Experimental Data: Part 1: (I,V) for a carbon resistorCalculated Value of the Resistor: 360 Ohms ± 5% Measured w/ Multi-meter: 359.2 OhmsCalculated using slope: 353.23Voltage:Current (mA):2.367.0064.02.0115.99.0168.20.02310.03.02812.03.03315.00.042Part 2: (I,V) for light bulb Resistance of the light bulb: 5.6 OhmsCalculated resistance of the light bulb using slope: 9.67 (1st