EEE 202 Lab 3

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Johns Hopkins University *

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202

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Electrical Engineering

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Apr 3, 2024

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Name: EEE 202 Lab 3 Data Sheet Part 1: Resistive Divider Build this circuit in LTspice and run a DC simulation: Include a screenshot of your LTSpice circuit here: 1

Build the circuit in hardware and using multimeter measure voltage at each node with respect to ground. Include a photo of your hardware-built circuit here: For the physical model a 2.2k resistor was used instead of a 2k resistor, and a 4.7k resitor instead Of a 5k resistor. Simulated Results Measured Results Node Voltage at N1 = 5 V Node Voltage at N1 =4.99 V Node Voltage at N2 = 4.54545 V Node Voltage at N2 =_4.54 V Node Voltage at N3 = 3.36364 V Node Voltage at N3 =3.557 V Node Voltage at N4 = 1.36364 V Node Voltage at N4 =1.436 V Node Voltage at N5 =0.454545 V Node Voltage at N5 =0.449 V Voltage across each resistor: Simulated Results (Use LTSpice or calculate by subtracting node voltages) Measured Results (Use a multimeter) Voltage across R1 =0.45455 V Voltage across R1 =0.447 V Voltage across R2 =0.90909 V Voltage across R2 =0.995 V Voltage across R3 =2.37372 V Voltage across R3 =2.119 V Voltage across R4 =0.909095 V Voltage across R4 = 0.986 V Voltage across R5 =0.454545 V Voltage across R5 = 0.449 V Measure the current flowing through each resistor: Simulated Results Measured Results 3

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(Use LTSpice) (Use a multimeter) Current flowing through the resistors = 0.454545 mA Current flowing through the resistors =0.449 mA 4

Part 2: More complicated Resistive Circuit Build this circuit in LTspice and run a DC simulation: Include a screenshot of your LTSpice circuit here: 12 K resistor : 10k +2.2 k 6k resisitor :4.7k +1 k 5

4 k resistor :2.2k*2 18k resistor :20k 9 k resistor :10k Physically build the circuit & using multimeter measure voltage at each node w/r to ground. Include a photo of your hardware-built circuit here: Simulated Results Measured Results Node voltage at N1 = 5 V Node voltage at N1 = 4.98 V Node voltage at N2 = 1.3333 V Node voltage at N2 =. 1.390 V 6

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Node voltage at N3 = 1.5 V Node voltage at N3 =. 1.411 V Using multimeter measure voltage across each resistor: Simulated Results Measured Results Voltage across R1 =166.66667 mV Voltage across R1 = 118.8 mV (28%error) Voltage across R2 = 3.6666667 V Voltage across R2 = 3.606 V Voltage across R3 =1.333333 V Voltage across R3 = 1.390 V Voltage across R4 = 1.5 V Voltage across R4 = 1.508 Voltage across R5 = 3.5 V Voltage across R5 = 3.487 V Current flowing across each resistor (note: include the sign, as long as the two absolute values are close enough, the grader won’t take off points) Simulated Results Measured Results Current through R1 = 27.777778 uA The positive current is flowing from (highlight the correct choice):  N2 to N3  N3 to N2 Current through R1 = 32 uA (18.5% error) The positive current is flowing from (highlight the correct choice):  N2 to N3  N3 to N2 7

Part 3: Superposition Build this circuit in LTspice and run a DC simulation Include a screenshot of your LTSpice circuit here: 2k =2.2k 330 = 3*100 Build the circuit in hardware and using multimeter measure voltage at each node with respect to ground. Include a photo of your hardware-built circuit here: 8

Simulated Results Measured Results Node Voltage at N1 = 3V Node Voltage at N1 = 2.993 V Node Voltage at N2 = 0.662207 V Node Voltage at N2 = 0.625 V Build this circuit in LTspice and run a DC simulation: Include a screenshot of your LTSpice circuit here: 2K = 2.2K 330=3*100 Build the circuit in hardware and using multimeter measure voltage at each node with respect to ground. Include a photo of your hardware-built circuit here: 9

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Simulated Results Measured Results Node Voltage at N2 = 0.551839 V Node Voltage at N2 = 0.472 V (14.46% error) Node Voltage at N3 = 5 V Node Voltage at N3 = 4.98 V Build this circuit in LTspice and run run a DC simulation: Include a screenshot of your LTSpice circuit here: 2k = 2.2k 330 = 3*100 Build the circuit in hardware and using multimeter measure voltage at each node with respect to 10

ground. Include a photo of your hardware-built circuit here: Simulated Results Measured Results Node Voltage at N1= 3 V Node Voltage at N1= 2.996 V Node Voltage at N2= 1.21405 V Node Voltage at N2= 1.097 V Node Voltage at N3= 5 V Node Voltage at N3= 4.98 V Do the node voltages from the first two circuits sum to match the voltages of the third circuit? Note any additional observations. 0.625 V + 0.472 V = 1.097 V , Yes they do Part 4: Wye-Delta Calculate the value of Rwye, to draw same current from the source. Show your work. Rwye=1/3 R =1/3*10k =3.3k Build this circuit in LTspice and run a run a DC simulation 11

Include a screenshot of your LTSpice circuit here: 9 k =10k 4 k =4.7k 12

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Build the circuit in hardware and measure the current drawn from the source (V1). Include a photo of your hardware-built circuit here: Simulated Results Measured Results Current drawn from source = 0.630342 A Current drawn from source = 0.507 mA Build this circuit in LTspice and run a run a DC simulation 13

Include a screenshot of your LTSpice circuit here: Rwye = 3.3k , however the closet restior combincation I could get was using a 1 k and 2.2k in series 14

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Answer the following questions about Part 4: 1. Did the simulated results from LTSPICE match your measured results? If your results did not match perfectly, what are some reasons that you think made the difference? They are roughly close, however with resistor discrepancies in part a and b of part qanitfy why the current wasnot exact. 2. What value is there in simulating circuits in LTSPICE before building and measuring them? It is ideal to simulate before building a physical model, that way you now what values of current and volume are expected, and you can adjust your voltmeter of currentmeter to detect with in the designated range, and take no risk in blowing a fuse in your meter. 16