EEETTTRRR 111111333 SUPERPOSITION THEOREM EQUIPMENT REQUIRED: 3 Assorted Resistors (between 1KΩ and 20KΩ) 2 Digital Multimeter 1 DC Power Supply PROCEDURE: 1. Measure all resistors and record their values in Table 1.

R1 R2

R3E1 E2

Figure 1 2. Construct the circuit shown in Figure 1. 3. Set E1 to 10 volts and E2 to 5v. Remember to change the straps on the power

supply so that E1 is a positive supply and E2 is a negative supply. 4. Measure the voltage across each resistor and record each in Table 2. Assume the

polarities shown in figure 1. 5. Remove E2 and place a jumper wire across the leads that were connected to E2.

The circuit should look like Figure 2.

R1 R2

E1 E2R3

Figure 2

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EEETTTRRR 111111333 6. Measure the voltage across each resistor and be sure to note the polarity of the

voltage across each. Record the results in Table 2. 7. Remove the jumper that was inserted in step 6 and put E2 back in the circuit.

Remove E1 and replace it with a jumper. The circuit should look like figure 3.

R1 R2

E1 E2R3

Figure 3 8. Measure the voltage across each resistor and be sure to note the polarity of the

voltage across each. Record the results in Table 2. 9. Solve for the voltages across R1, R2, and R3 in Figure 1 by algebraically combining

the voltages from steps 6 and 8. Compute the percent error between measured (step 4) and computed voltages.

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TABLE 1 Resistor Measured

R1 R2 R3

TABLE 2 Step VR1 VR2 VR3 4 6 8 9 % Error PSpice %Error PSpice : Analyze the circuit in Figure 1 using PSpice. The output file should show the voltage for each resistor. Do a second PSpice to evaluate the resistor voltages with E2 in the circuit and E1 replaced with a short. Do a third PSpice to evaluate the resistor voltages with E1 in the circuit and E2 replaced with a short.