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PHY 114Ohm’s LawCydni ScottPartners: Daniela Alcazar, Charles Stocks Section 12067TA: Omer Faruk Albayrak February 28, 2017AbstractFor this experiment, we had to determine the resistance of a resistor from an I – V graph, determine the resistivity of a graphite rod, and to determine the load resistance value at which power is optimized in a DC circuit. The theoretical resistance of the carbon resistor used was found to be 276.8Ω and this was found using a digital multimeter (DMM) and the experimental data was found to be 321.4Ω by using the slope from an I – V graph that we plotted. From these values, the percent error was calculated to be 13.9%. The resistivity of the graphite rod was calculated to be 6.73 • 10-6. The load resistance value at which power is optimized in a DC circuitwas found to be 100Ω by using the P vs RLgraph that we plotted. Then the power efficiency was calculated to be 50.
Experimental Data Part 1a: Current—voltage (I – V) characteristic for a carbon resistorTable 1: Carbon resistor’s resistance value Resistance value from color code331Ω +/- 5%Resistance value from DMM276.8Table 2: (I – V) data range Volts (V)Current (A)Resistance (Ω)1.1350.003378.33.040.009337.85.050.015336.77.060.021336.29.010.027333.712.090.037326.815.250.047324.5Graph 1: