lab2 7 - Winter Quarter 2009 0/35 Potential Differences...

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0 /35 Winter Quarter 2009 Winter Quarter 2009 Experiment: Potential Differences Your name: Cory Poynter Partner: Performed on: 3/18/2009 TA: Section number: Promptness % (100 means it was on time): 100 Additional Scores (+) /Penalties (-): Please insert your material in the space between or after the red or yellow boxes, not in the boxes themselves. Abstract (4) The purpose of this experiment was to determine internal or hidden resistances in a circuit by using two different methods to find the open circuit potential difference of a generator of potential difference and one of the methods does not draw current from the source. First we started by using the dry cell, and set up the circuit shown in Fig. 2 and then varied the resistance of the rheostat, to obtain at least ten values of the load current and the load voltage. Next we set up the circuit in Fig. 4.and measured the potential difference V from the zero end of the wire to the position of the contact point at ten positions x spread out along the length of the wire. Afterward we used the standard cell, assemble the circuit in Fig. 3 as illustrated in Fig. 5 and record the open circuit voltage of the standard cell from its label. After we found the position of the sliding contact that caused the opposite deflections on the galvanometer and gives a zero deflection the value was for the position was recorded as x s . Next we were to measure and record the terminal voltage of the dry cell with the Fluke DMM. Then we were to repeat the previous steps with the dry cell in place of the standard cell, and recording x for the position instead of x s . Finally we were to find the resistance of the battery eliminator set at 1.5 V and next the D-cell battery in place of the dry cell. The following data is what we obtained from the experiment:
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36 37 38 39 40 K L M N O P Q source value (v)u{V} (V) x (cm) u(X} (cm) standard cell 1.2267 0.0001 42.3 0.7 dry cell 1.4722 0.0015 52.6 0.1 D cell 1.4948 0.0015 48.9 0.1 battery eliminator 2.4904 0.0025 91.9 0.1 1 2 3 4 5 6 7 8 9 10 11 12 13 A B C D E F G H I J K Part 1- Internal Resistance part -2 side wire calibration I (mA) I (A) V(V) u{x} (cm) = 0.2 V(V) x(cm) 38 0.038 1.536 u{v}/V= 0.10% 2.64 100 43 0.043 1.534 2.39 90 50 0.05 1.532 u{I}a = 1% 2.14 80 56 0.056 1.53 u{V}= 0.10% 1.88 70 66 0.066 1.527 1.64 60 75 0.075 1.525 1.38 50 85 0.085 1.5220 Theoretical relationship v= ε -Ir 1.13 40 99 0.099 1.5180 "-r (ohms) ε (V) 0.88 30 146 0.146 1.5090 -0.198 1.541 0.63 20 302 0.302 1.4830 errors 0.009 0.001 0.35 10 0.13 0 Error: Reference source not found, 09/17/04, Error: Reference source not found Sample Calculations (5)   x (V))
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This note was uploaded on 07/13/2011 for the course PHYS 212 taught by Professor Adams during the Winter '08 term at Alabama.

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lab2 7 - Winter Quarter 2009 0/35 Potential Differences...

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