Report 4

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School

Florida Atlantic University *

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PHY2049L

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Electrical Engineering

Date

Apr 3, 2024

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docx

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Experiment 4: Voltmeter and Ammeter Student name: Juliana Dupuy Pre-lab section: 1) Introduction: Explain the theory behind this experiment in a paragraph between 150 and 250 words . (1.0 points) A precise electromagnetic tool, that is called a galvanometer is used to measure minute currents. The galvanometer can be made into either an ammeter or a voltage tester by adding a resistor. You can increase the galvanometer's range and establish a proportionality between the current and voltage drop across a regular resistor by adding a multiplier resistor. The multiplier resistor, represented as Rm: Rm = Vmax / (I - r), where "r" denotes the resistance under test, can be calculated using a variant of Ohm's law. For the circuit to function well, the voltmeter needs to be connected in parallel, however, an ammeter can be made by connecting a shunt resistor in parallel with the galvanometer and another resistor. In this case, Rs = (Ic / Imax) - Ic is applicable. In contrast, the ammeter needs to be linked in series with the circuit. It is important to keep in mind that both an ammeter and a voltmeter require specific resistances to detect current and voltage accurately. They cannot measure voltage perfectly. 2) Hypothesis: In an If /Then statement, highlight the purpose of the experiment. (1.0 points) If we build a lab-made dc voltmeter and a lab-made dc Ammeter, it is important to make figure it out the galvanometer's maximum allowable current and conduct an initial evaluation of its internal resistance. Post-lab section: 3) Discussion: In a paragraph between 100 and 150 words , explain what you learned from the results obtained in the experiment . What conclusion can you draw from the results of this lab assignment? (1.0 points) This experiment measures the currents and voltages using DMM and a lab-made voltmeter and ammeter. The values obtained from the DMM are compared to those obtained from the lab-made. The combination of a galvanometer combined with a modest "shunt" resistor to create an ammeter and a multiplier resistor to create a voltmeter is the foundation of theory. A lab-made voltmeter is linked parallelly to certain resistors to measure voltages, and a lab-made ammeter is connected to resistors to measure currents. To conduct this experiment, a DMM must be correctly added to the circuit between the galvanometer and the resistors. The voltage and current readings on the devices are then measured and compared. It turns out that in some situations, such as R2, the values on two devices are rather near to one another. Errors may occur when conducting the experiment, such as when measuring the current or cutting the circuit.

4) Conclusion: In one sentence, compare the results of the experiment with your Hypothesis. Why? (1 point) As I mentioned befor, we can accurately make a voltmeter and an ammeter by adding different resistances to a galvanometer. 5) Data Analysis: Attach an image of the data and instruction pages containing tables with final calculated values, figures, plots, charts and responses to questions or specified calculations here. (12 points) This should include: Table 1 (2 points) Table 2 (2.0 points) responses to questions and calculations in space provided for 2(a) – 2(e): 3.0 points Table 3 (2.0 points) responses to questions and calculations in space provided for 4(a) – 4(e): 3.0 points 6) Calculations: Attach an image all your calculation pages here . (0 points) Calculations will be included in the space provided in the data and instruction pages. Calculation guidelines: i . Label calculations for each table. ii. Write out formulas before plugging in measured values. iii. Values plugged into the formulas must contain units and proper number of significant figures (units must be written out throughout calculations). iv. Final calculated values recorded in tables and calculation pages must contain units and proper number of significant figures. All work for calculations must be shown to receive credit for data analysis . 7) End of Experiment Questions: Attach an image of the lab manual pages containing your responses to the end of experiment questions here. (4 points) This should include: Question 1: parts a: 0.5 points, parts b: 1.0 points, and part c 0.5 point Question 2: parts a and b: each 1.0 points, and part c: 0.5 point Lab reports must be written individually by each student from beginning to end. No credit will be given for copied work.

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