ET115W3Lab

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University of Arkansas *

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ET115

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Electrical Engineering

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Dec 6, 2023

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Uploaded by ProfessorOtter7308

Lab 2: Grantham University Date: November 7, 2023 Introduction:

In this lab I will be calculating and measuring Voltages across resistor 1, 2, and 3, as well as calculating the total amperage and resistance in the circuit. I am expecting the simulated results to be lower or higher than the calculated due to the tolerances applied to the resistors. This lab should teach me how to use an oscilloscope and function generator. Equipment/Components:  3x Resistors o 1k Ohm o 2.2k Ohm o 4.7k Ohm  Agilent Multimeter  Agilent Function Gen  Tektronix Oscilloscope Procedure: Briefly describe how you will approach the problem and try to solve the lab, describe and explain any techniques/rules/laws/principles you would use. Outline each step of the process. I will begin to calculate the required measurements. To start with I will calculate the total resistance, since it is a series of resistors they will be added together. After which I will calculate the total amperage following Irms=Vs(rms)/Rtot. From there I calculate the voltage across each resistor by using V=I*R. From there I can move on to getting the period from 60Hz source frequency and measure the period and frequency. Lastly I will start the last part and change R1 to the given variables and recalculate and measure V3. Circuit design: Execution/Results: Rt= 1k+2.2k+4.7k= 7.9k

Irms= 3V/7.9K = 0.0003797 =379.7uA V1=379.7uA*1k=0.3797=0.38V V2=379.7uA*2.2k=0.83534=0.84V V3=379.7Ua*4.7k=1.75459=1.75V T=1/f T=1/60Hz= 0.0167=16.7ms 3Vrms to PP for Function generation 3V*2.828=8.484V Copy/Paste the screenshots for all the measurements required in the lab here. Be sure to add a title and explain what each of the screenshots represent. Measurements of Voltage Across Resistors using Agilent MM. Measurements of Amperage using Agilent MM.

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Measurements of Ohms using Agilent MM. Measurements of Voltages across Resistors Using Tektronix

Measurements of Period and Frequency using Tektronix Measurements of VR3, Period and Frequency.

5K Ohms, 60Hz 25k Ohms, 60Hz 25k Ohms, 100Hz 25k Ohms, 200Hz

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Analysis: At 3Vrms 60Hz Calculated(rms) Agilent Multimeter(rms) Tektronix Oscilloscope(rms) VR1 = 0.38V 0.38V 0.38v VR2 = 0.84V 0.834V 0.84V VR3 = 1.75V 1.78V 1.78v IT = 379.7uA 380uA N/A RT = 7.9K Ohms 7.9K N/A Calculated period R3: Source frequency (60Hz) Measured Period: Measured Frequency: 16.7ms 16.6ms 60Hz Source Frequency 60 Hz Tektronix Oscilloscope Measurements R1=5K Ohms VR3 =1.19V Period = 16.6ms Frequency =60Hz R1=25k Ohms VR3 =441mV Period =16.6ms Frequency =60Hz Source Frequency 100Hz R1= 25k Ohms VR3 =441mV Period =10ms Frequency =100Hz Source Frequency 200Hz R1=25k Ohms VR3 =441mV Period =5ms Frequency =200Hz Conclusion:

My calculations and measured values match very closely minus a few variations due to rounding differences. From my observations the multimeter does not give me peak or peak to peak functions those values come from the oscilloscope, but it does give me the rms value. The oscilloscope will measure the the rms,pp,and peak values and once you set up the devices properly it can ouput the same as what the multimeter does. The choice between reporting peak or RMS difference between scenarios, if you need to take in account the max voltage for safety reasons you would report Peak values otherwise RMS is more commonly used for calculating power or used for comparison. Increasing the resistance of R1 only really changes the amount of voltage across the other resistors and reduces the total amps. Resistance does not depend on frequency and voltage and current stay the same in changes of frequency.