Lab Report 5 - PHY 114 Ohms Law Cydni Scott Partners...

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PHY 114 Ohm’s Law Cydni Scott Partners: Daniela Alcazar, Charles Stocks Section 12067 TA: Omer Faruk Albayrak February 28, 2017 Abstract For 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 circuit was found to be 100Ω by using the P vs R L graph that we plotted. Then the power efficiency was calculated to be 50.
Experimental Data Part 1a: Current—voltage ( I – V ) characteristic for a carbon resistor Table 1: Carbon resistor’s resistance value Resistance value from color code 331Ω +/- 5% Resistance value from DMM 276.8 Table 2: ( I – V ) data range Volts (V) Current (A) Resistance (Ω) 1.135 0.003 378.3 3.04 0.009 337.8 5.05 0.015 336.7 7.06 0.021 336.2 9.01 0.027 333.7 12.09 0.037 326.8 15.25 0.047 324.5 Graph 1:

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