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EAST WEST UNIVERSITY Course Name : Electric Circuits - I Course Code : EEE 101 LAB Section No : 02 Group No : 06 Experiment No : 06 Name of the Experiment : Verification of Thevenin’s theorem Date of allocation : 24/03/2013 Date of submission : 31/03/2013 Submitted To : Mariam B. Salim Student’s ID : 2013-1-80-022 Student’s Name : Md. Solayman Khan Objective: The objective of this exmeriment was to verify the Thevenin’s theorem by applying the principle to a practical electric circuit.SPICE simulation is also going to be used to verify this principle. Circuit diagrams: Figure 1(a) :Diagram of the circuit whose Thevenin’s equivalent circuit was determined (without simulated results): Figure 2(a) :Diagram for measuring the open circuit voltage (without simulated results): Figure 3(a) :Diagram for measuring the short circuit current (without simulated results): Figure 4(a) :Circuit diagram for verifying the thevenin’s theorem (without simulated results): Answer to the que no 1 : Experimental datasheet is attatched at the last of the post-lab report. Answer to the que no 2 : Comparison of VL and IL between figure 1 and figure 4 according to experiment data : Type Figure 1 Figure 4 VL(v) 3.25 3.26 IL (mA) 3.289 3.3 Answer to the que no 3 : All four simulated circuits are attatched after this page. According to simulated results, From figure 1, VL=3.249v IL=3.288mA From figure 2, VOC=7.076v From figure 3, ISC=6.08mA From figure 4, VL=3.266v IL=3.305mA Discrepancy between the values of figure 1 and figure 4: Discrepancy of VL: (⃒(3.249 - (3.266)) / 3.249 ⃒) ×100%=0.523%<10% Discrepancy of IL: (⃒(3.288-(3.305))/ 3.288 ⃒) ×100%= 0.517%<10% As,the discrepancy is less than 10% ,So,it can be said that,Theveni’s theorem is verified with my simulated data. Figure 1(b) :Diagram of the circuit whose Thevenin’s equivalent circuit was determined (with simulated results) : Figure 2(b) :Diagram for measuring the open circuit voltage (with simulated results): Figure 3(b) :Diagram for measuring the short circuit current (with simulated results): Figure 4(b) :Circuit diagram for verifying the thevenin’s theorem (with simulated results): Answer to the que no 4 : Comparison among measured , Calculated and simulated values : Resistors: Type Measured Calculated Simulated R1 (kΩ) 1.001 1 1.001 R2 (kΩ) 3.29 3.3 3.29 R3 (kΩ) 4.6 4.7 4.6 R4 (kΩ) 0.979 1 0.979 RL (kΩ) 0.988 1 0.988 RTh (kΩ) 1.16 1.18 1.16 Voltage sources: Type Calculated Measured Simulated V1(v) 10 10 10 V2(v) 5 5 5 Voltages: Type Calculated Measured Simulated VL(v) Fig.1 3.26 3.25 3.249 VOC(v) 7.09 7.1 7.076 VTh(v) 7.09 7.1 7.1 VL(v) Fig.4 3.252 3.26 3.266 Currents: Type Calculated Measured Simulated IL(mA) Fig.1 3.26 3.289 3.288 ISC(mA) 6.034 6.1 6.08 IL(mA) Fig.4 3.252 3.3 3.305 Comment : From the comparison among measured , Calculated and simulated values,we can see that there is almost no discrepancies among those values. And the discrepancy that we got was for the discrepancy of the values of resistences. Conclution : In this experiment, we verified Thevenin’s theorem in both lab and PSPICE. Now we can convert two terminal linear circuits into a voltage source in series with a resistence as well as Thevenin’s equivallent circuit.