CECS211_Lab_2_-_Series_Circuits (1)

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California State University, Long Beach *

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211

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Electrical Engineering

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Jan 9, 2024

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NAME: NGOC TRAN POSSIBLE POINTS: 10 STUDENT ID: 030856564 COURSE DATE & TIME: 01/26/2023 DIRECTIONS: Step 1: Solve the Circuit By Hand You may solve this circuit on the printed copy of this page or include it on a separate sheet of paper. It’s your choice. Fill in the following table and questions: R T R1+R2+R3=100 Ω +200 Ω +300 Ω = 600Ω The Following 3 voltages are the voltages at node a,b,c. This is different than the voltage across a component. It is taken with respect to a 0v reference, in our case this can be assumed to be the ground symbol I T V T R T = 12 V 600 Ω = 20 mA I R1 20mA I R2 20mA I R3 20mA V R1 20mA x 100 Ω = 2V V a 20mA x (200+300+100) Ω = 12V V R2 20mA x 200 Ω = 4V V b 20mA x (200+300) Ω = 10V V R3 20mA x 300 Ω = 6V V c 20mA x 300 Ω = 6V P R1 I R 1 ×V R 1 = 20 mA × 2 V = 40 W P R2 I R 2 ×V R 2 = 20 mA × 4 V = 80 W P R3 I R 3 ×V R 3 = 20 mA × 6 V = 120 W KVL Equation: V R 1 + V R 2 + V R 3 = V 1 Why is I R1, I R2, I R3 the same: - As this is a series circuit, we only have one path for current to flow, so we will never gain or lose the current, which means the current is the same at every point of the CECS 211 - LAB 2 Series Resistors, Voltage Drops and KVL

series circuit. That is the reason why I R1, I R2, I R3 are the same. Step 2: Create LTSpice Circuit and Run DC Operating Point Analysis Open LTSpice and create the series circuit with V1,R1,R2,R3. Use the “Label Net” tool to label nodes a,b,c as shown in the circuit. Run a DC Operating Point Simulation. Notice the results only show the voltages at the nodes/net labels. From these results, node voltages, calculate V R1 , V R2 , V R3 and show the equation for each: Equation: V=IR V R1 : 20mA x 100 Ω = 2V V R2 : 20mA x 200 Ω = 4V V R3 : 20mA x 300 Ω = 6V Do these match your calculated values from Step 1? ________YES _______________ Do the currents match your calculated values from Step 1? _____YES_ ____________ Step 3: Transient Analysis Change the LTSpice simulation to a Transient Analysis with a 1sec runtime and run. Take a voltage measurement at the following nodes, inspect the signal to get the precise value and record the values. There is no need to include a screenshot yet. V a 12V V b 10V V c 6V Do these match step 1 and 2? ____ YES _______ CECS 211 - LAB 2 Series Resistors, Voltage Drops and KVL

Now take a Current Measurement of R1, R2, R3 and inspect the signals to get the precise value. Record these in the following table. I R1 20mA I R2 20mA I R3 20mA Do these match the results from step 1 and 2? ____ YES _______ Now take a Differential Voltage Measurement (Measured between 2 points) across each of the following, inspect each signal and record in the table. V R1 2V V R2 4V V R3 6V Do these match the results from step 1 and 2? _____ YES____ ___ Now take a Differential Voltage Measurement (Measured between 2 points) across R1 and R2. Inspect the signal to get the precise value and include a screenshot that clearly shows the circuit, the waveform, and the inspected signal for this measurement. Does this match V R1 + V R2 ? ______ YES ___________ Deliverables - Lab Write-Up: CECS 211 - LAB 2 Series Resistors, Voltage Drops and KVL

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The lab write-up will consist of this document filled out, printed and submitted. CECS 211 - LAB 2 Series Resistors, Voltage Drops and KVL

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