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# Report2 - Lab Project 2 Electrolyzer Experiment ES100...

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Lab Project 2: Electrolyzer Experiment ES100, Spring 2005 Section 25 Lab Date: 04/12/05 Report Submission Date: 04/25/05 Report: Lewis Tyler Wiring: Fareed Tinorgah Measurements: Joe Contini Software: Robert Galen

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1. Objective The purpose of this experiment is to measure the amount of current that passes through an electrolyzer, using sensors, at different voltages and then measuring the displacement of distilled water, keeping the electrolyzer at a constant voltage. 2. Procedure 2.1 Task One The voltage was increased by increments of 0.1 V, starting from 0.2V up till 2.0 V. After every increment, the mark button was hit and LabView recorded temperature, pressure, time elapsed, supply voltage, and electrolyzer voltage for every change of voltage on the electrolyzer. 2.2 Task Two In this task, the voltage was kept at a constant 1.8V and the volumes of the water in the hydrogen and oxygen tanks were topped up to the zero mark. The electrolyzer was then turned on while hitting the output button on the power supply simultaneously. When the amount of water displaced in the hydrogen tank was down to zero, the electrolyzer was stopped, simultaneously hitting the output button on the power supply to put it off. The measured displacement in both tanks was noted. The same procedure was then repeated with the voltage set to 2.0V. 3. Results 3.1 Task One The collected data was imported into MATLAB, and code written to create separate arrays for each category of data (pressure, voltages, temperatures, etc.) for each data set. The current was then calculated and plotted against the electrolyzer voltage as shown in Figure 1.
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 -0.2 0 0.2 0.4 0.6 0.8 1 1.2 1.4 Current (A) Electrolyzer Voltage (V) Figure 1: Electrolyzer Voltage vs. Current 3.2: Task Two In MATLAB, new arrays were generated from previous data creating current, average current, and time elapsed for both trials. Theoretical values for the amount of hydrogen produced were calculated from the average current and time elapsed in both trials. For trial two, the predicted volume of hydrogen was 49.5219ml, and for trial three 51.1085ml. The recorded value in both cases was 37.5ml. Percent error was then calculated from these values. Trial two produced a 19.22% error, and trial 3 produced 21.7% error. The percent error for the ratio of hydrogen to oxygen was also calculated. Since the formula for water is H 2 O, the hydrogen to oxygen ratio should be 2:1 because there is twice as much hydrogen as there is oxygen. For trial two, the ratio was 2:1, and for trial three the ratio was 2.05:1. This resulted in a 0% error for trial two, and a 2.56% error for trial 3. 4. Discussion 4.1 Part One The graph from part one shows that as the voltage increases the current increases as well. From the graph, you can observe that at first when you increase the voltage it will not push the current through the resister. After it gets to a certain point, it is able to flow through the resister and the current goes up at a constant. The errors that account for why our graph did not turn out as expected

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were explained above in Section 3.1.
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