tda_dundooah_249

# tda_dundooah_249 - /35 Spring Quarter 2008 Spring Quarter...

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Unformatted text preview: /35 Spring Quarter 2008 Spring Quarter 2008 Experiment : Temperature Dependence of Resistance Your name: Anish Dundoo Partner: Andrew Nels Performed on: 15 th May, 2008 TA: Huard Zach Section number: 249 Promptness % (100 means it was on time): 100 Additional Scores (+)/Penalties (-): Please insert your material in the space after the yellow boxes, not in the boxes themselves. Abstract (4) This lab deals with finding the resistance of a coil and the thermistor at different temperatures recorded in Celsius. A resistance meter was connected to both the metal and the semiconductor. The coil and the thermistor were positioned in boiling water and ice was then gradually added to lower the temperature. This enabled us to find the resistances at various temperatures. From these values we were then able to calculate the values for α = 0.00377 1/˚C and ε = 0.81eV. These values compared closely to the values of Silver and Germanium. The graph of metals resulted in a slope of 98.03±0.40 (1/Ω* ± C) expressing change in resistance with temperature. All values calculated compared closely to the experimental values. Sample Calculations (5) Converting temperature from Celsius (C) to Kelvin (K): =( )+ . Temperature in kelvin Temperature in celsius 273 15 = . ( )+ . T K 97 2 C 273 15 = . T K 370 35 Converting resistance from Kilo Ohms (k T ) to Ohms ( T ): = * R Ω RkΩ 1000 = . * RΩ 2 15kΩ 1000 = . RΩ 2 150 Calculating 1/2kT (1/eV): = 12kT1eV 12kT = .- ( . ) 12kT1eV 128 62E 5evk 368 2K = . 12kT1eV 15 751eV Error: Reference source not found, 09/17/04, Error: Reference source not found Calculating (eV): Ԑ Ԑ ( )= eV lneԐ Ԑ ( )= . eV lne2 24 Ԑ = . eV 0 81 Calculating α ( / 1 C ): = - *- α1℃ R RrefRref 1T Tref = . α1℃ 138 12- . . *- Ω 107 7Ω107 7Ω 195℃ 20℃ =. α1℃ 00377 Calculating the Uncertainty of α ( / 1 C ): { } =- /( - ) u α 1℃ uR RrefRref T Tref : On applying rule 3 from lab referencesAB = * { } + { }...
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tda_dundooah_249 - /35 Spring Quarter 2008 Spring Quarter...

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