LAB 2 REPORT ECA---

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Auburn University *

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2110

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Electrical Engineering

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Apr 3, 2024

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pdf

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ELEC-2110 Electrical Circuit Analysis FROM: Gracin Wilson TO: Joshita Majumdar DATE: 01/31/24 LAB SECTION: 005 Electrical Measurements: Breadboarding, NI ELVIS, Multimeter, Lab Reporting

Gracin Wilson Electrical Measurements: Breadboarding, NI ELVIS, Multimeter, Lab Reporting January 31, 2024 Introduction: The purpose of this lab is to introduce students to the equipment and methods they will be using for the rest of the semester. They will become familiar with using the NI ELVIS board and multimeter, along with measuring and recording currents, voltages, and resistances. Following the lab procedure will ensure students learn how to write a professional lab report for this lab and future labs throughout the semester. Lab Exercise A: Resistances At the beginning of the lab, students are asked to grab 3 different resistors, R1= Red, Red, Red, Gold; R2= Brown, Green, Red, Gold; R3= Yellow, Violet, Brown, Gold. With those resistors, students will need to calculate the theoretical, minimum, maximum, actual, and percent error values. To get the theoretical value, you follow the color code chart for the resistor colors shown in Table 1 below. To get the minimum and maximum, they will take the theoretical value and multiply that by 5%. The students will then need to add the 5% to the theoretical value for the maximum and subtract the 5% from the theoretical value for the minimum. To get the actual value, the students will use the multimeter and measure the resistance. After those steps, they will need to calculate the percent error using the following equation, %error=((theoretical- actual)/ theoretical) x 100%. All the values are listed in Table 2 below. Students will also need to hold one of the multimeter probes in each hand to measure their skin resistance across their chest. This means that they should not hold the resistor while they are measuring its resistance because the multimeter is an open circuit, and the internal resistance is infinite. Their skin resistance would throw off the measurement. My skin resistance is 1.2 mega ohms. Next, students will need to place R2 and R3 in parallel on the breadboard shown in Figure 1 and measure the equivalent resistance for the parallel combination using the multimeter. They will

Gracin Wilson Electrical Measurements: Breadboarding, NI ELVIS, Multimeter, Lab Reporting January 31, 2024 also need to hand calculate the equivalent resistance using the measured resistor values shown in Table 2 and these values are shown in Figure 2. Then, the students will need to place R1 in series with the parallel combination of R2 and R3 to record the total resistance shown in Figure 3 . Hand calculations using the Table 2 values are also required for the total resistance and will be shown in Figure 2. All of the values are shown in Table 3. The measured values recorded for R1, R2, and R3 all fall within the theoretical maximum and minimum values and the formulas for parallel and series resistance appear to be accurate. Resistor Theoretical Resistance Minimum Resistance Maximum Resistance Actual Resistance Percent Error R1 2200 2090 2310 2180 0.91% R2 1500 1425 1575 1490 0.67% R3 470 446.5 493.5 470 0% Table 2: Theoretical Resistance Values in ohms

Gracin Wilson Electrical Measurements: Breadboarding, NI ELVIS, Multimeter, Lab Reporting January 31, 2024 Figure 1 Figure 2 Figure 3 Resistor Measured Resistance Calculated Resistance Req 360 357.30 Rtot 2560 2537.30 Table 3: Combination Equivalent Resistance in ohms

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