Experiment

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St. John's University *

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1000

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Electrical Engineering

Date

Apr 3, 2024

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docx

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9

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Experiment: Ohm’s Lab
Part 1: Resistor 1 Y = 0.083x + 0.05 Measured R: 83 ohms Calculated R: 85.47 ohms I V 50 4.2 40 3.4 30 2.5 20 1.7 10 0.9
Part 1: Resistor 2 Y = 0.052x + 0.02 Measured R: 52 ohms Calculated R: 52.57 ohms I V 50 2.6 40 2.1 30 1.6 20 1.1 10 0.5
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Part 1: Resistor 3 Y = 0.042x - 0.04 Measured R: 42 ohms Calculated R: 40.4 ohms I V 50 2.1 40 1.6 30 1.2 20 0.8 10 0.4
Part 2: All in Series Y = 0.196x + 0.64 Measured R: 196 ohms Calculated R: 215.47 ohms I V 50 9.2 40 8.8 30 7.0 20 5.2 10 1.8
Part 2: Parallel Y = 0.02x Measured R: 20 ohms Calculated R: 20 ohms I V 50 1 40 0.8 30 0.6 20 0.4 10 0.2
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Part 3: Series/Parallel y = 0.029x + 0.13 Measured R : 29 ohms Calculated R: 34.73 COMBINATION CALCULATED R MEASURED R % DISCR I V 50 1.6 40 1.2 30 1.1 20 0.7 10 0.4
ALL IN SERIES 178.44 196 9.84% ALL IN PARALLEL 18.03 20 10.93% SERIES & PARALLEL 31.25 29 7.2% Questions: Question 1: Should the lines of best fit pass through the origin of the graphs of V vs. I? A: Yes, the lines of best fit should pass through the origin of the graph because when referring to the current we know that it is zero, since the current is zero the voltage would also have to be zero. We need the equation that V=IR which represents the current and resistance, if current is at zero, the resistance would also be that number. Question 2: Could the zero readings of your ammeter and voltmeter be used as a data point when drawing the graph? Explain. A: Yes, the zero readings of the Ammeter and Voltmeter can be used for drawing the graph because the ammeter should have an initial reading at zero ohms, which indicates that the voltage is not present. The zero readings indicate no current flow for the ammeter and no voltage change. Through identifying these zero readings, it is vital for understanding circuit behavior. Question 3: Suppose somebody, using the same apparatus which you used, measured I = 45.5 ma, and V = 8.2 volts on some resistor. Using your recorded uncertainties for the 50 ma and 10-volt scales, what would be the maximum % uncertainty in R if it were calculated from the Ohm’s Law Equation (1)? Use calculus methods to answer this question if you can. A:
Question 4: Explain what could have caused the discrepancies between your calculated and measured resistances in Part II. A: What could have caused the discrepancies between my calculated and measured resistance could have been incorrectly placing the circuits in parallel, series, or series parallel. Human error could have also been the cause for the discrepancies through miscalculations and setup. Conclusion: In the final analysis, we were able to understand the concept of Ohm’s law through the experiments in the lab. We were able to use different apparatuses such an Ammeter and a Voltmeter and discovered the function of resistors in series and parallel circuits. In this experiment we focused on the capacitors in series, parallel, and series-parallel circuits. My percent discrepancies were 10.93% which was the highest in all in parallel. This high discrepancy could be the cause of a human error or improper wire placements.
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