Ohms Law lab report

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University of Mississippi *

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222

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Law

Date

Apr 3, 2024

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pdf

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Uploaded by ChiefSteelHedgehog20

Pora, Logan Simanonok, Max Khadse, Akshay, Section: 2 Ohm’s Law 02/19/2024 Introduction The objective of the experiment was to observe Ohm’s law using the relationship between voltage and current. We observed our voltage and current through 3 resistors on a circuit board. We used the DMM to observe it from one to ten volts and then plotted our current versus our voltage on LoggerPro. We knew the inverse of the slope of the linear values would be reltated to our resistance value in Ohms due to Ohm’s Law Data Plots / Charts (Attached to Back) Results Resistance(DMM) Resistance(Code) % Dif Resistance(Plot) % Dif 190 Ω 150 Ω 26.7 % 157 Ω 17.4 % 435 Ω 330 Ω 31.8 % 365 Ω 16.1 % 600 Ω 520 Ω 15.4 % 578 Ω 3.7 %

Disscusion of Results To start the experiment we were given three resistors with known values given from the color coordination chart. We then plugged erach resistor into our DMM and measured the Ohms given as 190, 435, and 600. Compared to our known values based on the code we were given a percent difference of 26.7, 31.8, and 15.4 %. We believe our percent difference was so high when comparing the DMM and known values because of the DMM calibration being off. We also think there could have been a slight disconnect between the resistor and DMM which gave us a wrong value. We then made our resistor circuit and used two DMM’s to observe the voltage and current through our resistor. We got our values from a range of one to tem volts and made a linear plot of amps versus voltage for all three resistors. We knew the inverse of the slope of each linear line would be equal to the resistance value of our resistor. The plot gave us resistor values of 157, 365, and 578. The values for resistance from the plot were much closer to our given resistor values. We then got the percent difference between the plot values and our DMM values which gave us 17.4, 16.1, and 3.7. We still think the percent difference was off from the DMM due to the previous reasons. We then examined the same pathway but we used a lightbulb as our resistor. We gathered data from one to ten volts again, but we also included .2, .4, .6, and .8 volts. When we plotted these values in LoggerPro we found that the resistance of a light bulb does not follow a linear pathway. We believe this is due to it not being a perfect resistor and it has a function that leads to un linear power usage. Post-Lab Questions 1a.) The 150 ohms resistor produces the most power at 10 volts

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