EEE 202 Lab 1 Data Sheet

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School

Arizona State University *

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202

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Electrical Engineering

Date

May 30, 2024

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docx

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Name: ____ _______________________________ EEE 202 Lab 1: Data Sheet LTspice, Basic Circuitry, and Measurement Part 1: Building a Basic Circuit Build this circuit in LTspice and run a DC simulation: The first time you ran this simulation, did you get any errors? What were they? How did you correct them? I followed the video set up when I set it up and there were no errors. It ran seamlessly. Why use software like LTspice to simulate a circuit before physically building it? Using LTspice to simulate a circuit before building it has many advantages. It saves money by catching design flaws early, reduces the risk of damaging parts, and speeds up the design process. Simulations let you optimize performance and understand circuit behavior without needing physical prototypes. You can perform complex analyses easily and test large, intricate designs that would be hard to build in real life. Plus, it's great for learning, as it provides hands-on experience without requiring lots of lab equipment. Overall, LTspice makes circuit design safer, cheaper, and more efficient. 1

Simulation Results: Run a DC Operating Point (.op) simulation and record the results Node 001 Voltage = ______ 5 ______V Current Across R1 = _____ -0.005 ______A Schematics: Label and attach the LTspice schematic of your circuit to the lab data sheet. Be sure to rename the node something different than N001. Part 2: DC Sweep Build this circuit in LTspice and run a DC Sweep simulation: Draw Plots: Sweep the DC supply voltage linearly from 0V to 9V in steps of 1V. (.dc) DC Sweep of Voltages (V(n1), V(n2), V(N1, N2)) DC Sweep of Power Dissipated in R1 2

Does the static value of the DC supply impact the output of the DC sweep? Why or why not ? DC sweep output stays constant regardless of the static DC supply value because the DC sweep runs within a set voltage range of 1V to 10V with a 1V step size. If you sum the power dissipated by resistor 1 and the power dissipated by resistor 2, how does that total sum compare to the power supplied by the voltage source? Why? This aligns with the rule of conservation of energy, and Kirchhoff's Voltage Law further clarifies this by stating that when all components have the same current flowing through them, the sum of the voltages around any closed loop is zero. Schematics: Label and attach here a screenshot of the LTspice schematic of your circuit to the lab data sheet. Be sure to label your nodes: Part 3: Voltage Divider Build this circuit in LTspice and run a DC simulation (.op) using the three values for R2 noted below: 3 Include this resistor in your simulation, but it represents a low resistance multimeter, so don’t include it in your actual physical measurements.

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Using the following values of R2, find the voltage drop across R2 in your LTspice simulation and then use the multimeter to measure the voltage across R2 in your physical circuit. Resistor (R2) value Simulated Results (with R3) Measured Results (no R3) 5k  Voltage Across R2=__ 0.96 V ____ Voltage Across R2 = __ 1V ____ 20k  Voltage Across R2=_ 2.27V ___ Voltage Across R2 = _ 2.5V__ 100k  Voltage Across R2=_ 3.57V ___ Voltage Across R2 = __ 4.17V In the simulation, R3 depicts a multimeter with a low input resistance. Explain why low input resistance is not ideal. The data shows that removing R3 results in higher outcomes compared to when R2 has a lower voltage. This happens because R3, when connected in parallel to R2, lowers the overall resistance. In parallel circuits, the total resistance is always less than the smallest individual resistance. If R3 has a high resistance and R2 has a lower restricts, it restricts current flow, enabling accurate voltage measurement. However, having low input resistance is not ideal for this purpose. 4