Week 2 Lab 2 Series RL Circuits Lab Report (1)

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ECPI University, Virginia Beach *

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120

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Electrical Engineering

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Feb 20, 2024

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docx

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Electric Circuits Lab Instructor: ----------- Series RL Circuits Student Name(s): Carl Harrison Click or tap here to enter text. Honor Pledge: I pledge to support the Honor System of ECPI. I will refrain from any form of academic dishonesty or deception, such as cheating or plagiarism. I am aware that as a member of the academic community, it is my responsibility to turn in all suspected violators of the honor code. I understand that any failure on my part to support the Honor System will be turned over to a Judicial Review Board for determination. I will report to the Judicial Review Board hearing if summoned. Date: 1/1/2018

Contents Abstract ....................................................................................................................................................... 3 I ntroduction ................................................................................................................................................ 3 Procedures .................................................................................................................................................. 3 Data Presentation & Analysis ...................................................................................................................... 4 Calculations ............................................................................................................................................. 4 Required Screenshots .............................................................................................................................. 4 Conclusion ................................................................................................................................................... 4 References ................................................................................................................................................... 5 2

Lab Report Instructions: (This instruction box is to be deleted before submission of the Lab report) Before starting on your lab report, please follow the following steps: 1) Follow the instructions listed provided in the lab instructions. 2) Complete this lab report . Upon completion, you will submit this lab report and your working Multisim files to your instructor. Abstract (This instruction box is to be deleted before submission of the Lab report) What is an Abstract? This should include a brief description of all parts of the lab. The abstract should be complete in itself. It should summarize the entire lab; what you did, why you did it, the results, and your conclusion. Think of it as a summary to include all work done. It needs to be succinct yet detailed enough for a person to know what this report deals with in its entirety. Objectives of Week 2 Lab 2:  Understand the effect of frequency on inductive reactance.  Measure the impedance of an RL circuit.  Measure the phase angle and phase lead of an RL circuit using the oscilloscope.  Draw the impedance and voltage phasor diagrams.  Understand how an inductor differentiates current. I ntroduction (This instruction box is to be deleted before submission of the Lab report) What is an Introduction? In your own words, explain the reason for performing the experiment and give a concise summary of the theory involved, including any mathematical detail relevant to later discussion in the report. State the objectives of the lab as well as the overall background of the relevant topic. Address the following items in your introduction:  What is Impedance for an RL circuit? (Give formula)  What is phase angle for an RL circuit? How is it calculated?  What is phase lead for an RL lead circuit? How is it calculated?  How/why does an inductor differentiate current? Give formula. 3

Procedures (This instruction box is to be deleted before submission of the Lab report) This section should contain the procedures as outlined in the lab instructions. Part I : 1. Connect the following circuit. R 1kΩ L 100mH 1Vrms 1 kHz Figure 1: RL Circuit 2. Connect one DMM across the resistor and one DMM across the inductor. Set both DMMs to read AC Voltage. Measure the voltage drop across each component. Record the result in Table 1 . 3. Use Ohm’s law to calculate the current flowing through the resistor. Since the circuit in Figure 1 is a series RL circuit, the same current will flow through the inductor and the resistor. Record the result in Table 1 . Total current I = V R R 4. Calculate the inductive reactance using Ohm’s law. Record the result in Table 1 . Inductive Reactance X L = V L I 5. Finally, calculate the inductive reactance using the inductive reactance equation. Record the result in Table 1 . Inductive Reactance , X L = 2 πfL 4

6. Adjust the function generator frequency following the steps in Table 2 . Use the DMM to measure the voltage across the resistor and the inductor. Record your measurements in Table 2 . 7. Plot the graph for Frequency vs. V L . Part II: 8. Build the circuit in Figure 2 . Figure 2: Series LR Circuit 9. Set the voltage source amplitude to 1.5 V P and frequency to 25 kHz, sine wave 10. Connect Channel A of the oscilloscope across the resistor and measure the peak voltage drop (V R ). Record the result in Table 3 . 11. Use Ohm’s law to calculate the peak current flowing through the resistor. Because it is a series circuit, the same current will flow through the inductor. Record the result in Table 3 . Total current I = V R R 12. Connect Channel B of the oscilloscope across the inductor and measure the peak voltage drop (V L ). Record the value in Table 3 . 13. Calculate the inductive reactance using Ohm’s law. Record the result in Table 3 . Inductive Reactance X L = V L I 5

14. Now, calculate the total impedance (Z T ) value using the equation . Record the result in Table 3 . Total Impedance (Z T ) = V S I 15. Calculate the phase angle between V R and V S using the formula . Record the result in Table 3 above. Also, record this value in Table 4 under Phase Angle calculated value. Phase angle, θ = tan − 1 ( X L R ) Part III: Phase Angle and Phase Lead Measurement Phase Angle 16. Connect Channel B of the oscilloscope across the voltage source and run the simulation. Channel A should still be connected across the resistor. 17. The waveforms should look like the ones shown in Figure 4 . Figure 4: V S and V R waveforms 18. Obtain a stable display showing a couple of cycles for Channel B (which is showing V S ) and disable Channel A by setting it to 0. 6

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