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# lab1 - Diana Wu 7 October 2008 Physics 4BL Sec 5...

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Standard Deviation Values vs Sample Size 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0 20000 40000 60000 80000 100000 120000 Sample Size (count) Standard Deviation (V) SD of One Run SD of Mean Values Diana Wu 7 October, 2008 Physics 4BL Sec 5 Uncertainties and Statistics of Circuits with Varying Voltages II. Introduction Random errors occur frequently when making measurements. In this lab, we will analyze the error in our voltage measurements to determine the impact of random errors on the accuracy of our data. III. Experimental Results To collect the data, we used a Zener diode, circuit board, power supply, battery, and Labview. We varied the voltage by switching among the Zener diode, battery, and random connections between the voltage ports on the circuit board, and we varied the resistance by connecting a random voltage to the LED. With each setup, we used Labview to measure the voltage and calculate the statistics. III.2: Add Two Random Voltages V1 V2 V1+V2 Mean (V) 0.0368 Mean (V) 0.0254 Mean (V) -0.0765 SD (V) 1.82 SD (V) 0.193 SD (V) 1.87 III.3.1: Constant V and Varying R III.3.2: Constant R and Varying V Mean (V) 1.3 SD (V) 0.101 III.3.3: Varying R and V Mean (V) 1.31 SD (V) 0.133 Mean (V) 0.753 SD (V) 0.0486

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