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UNIVERSITY OF MASSACHUSETTS DARTMOUTH DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING ECE 201 CIRCUIT THEORY I SUPERPOSITION BACKGROUND The principle of Superposition states that the total response of a linear circuit excited by more than one independent source can be represented as the algebraic sum of the responses to each source applied individually. In this experiment, you will determine the voltage across and the current through a resistor in a circuit that is excited by two independent voltage sources by measuring the contribution from each source acting individually and the total response due to both sources. PRELIMINARY WORK / PRELAB Determine the voltage across and the current through the 100Ω resistor in the circuit shown in Figure 1 by using Superposition. Perform all of the calculations and create a table of the expected results in your lab notebook. Your table should include the results due to each source individually as well as the results due to both sources simultaneously. Run a Multisim simulation to verify the expected values of the voltage and current. Hand in a copy of both your solution and the Multisim simulation to the instructor or TA for their approval before the lab session starts. R3Voltage + 0.000 V DC 1MOhm R1 R3 470 Ohm 100 Ohm R3Current 0.000 A R5 + 220 Ohm DC 1e-009Ohm V1 12 V R2 560 Ohm R4 330 Ohm Figure 1. A linear circuit excited with two voltage sources. V2 6V PROCEDURE/RESULTS Construct the circuit in Figure 1 on your breadboard, making sure to provide a method for easy connection of the measurement instruments. In your lab notebook, prepare a table to record the values of the voltage across and the current through the 100Ω resistor that you measure with your multimeters under the following conditions: a) applying the 12V source only b) applying the 6V source only c) applying both sources How do your measured values compare with the expected results determined in the Preliminary Work? 2