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THEORY ➤ Thevenin's Theorem: A two terminal network can be replaced by a voltage source with the value equal the open circuit voltage across its terminals, in series with a resistor with the value equal to the equivalent resistance of the network. ▸ Norton's Theorem: A two terminal network can be replaced by a current source with the value equal to the short circuit current at its terminal, in parallel with a resistor with the value equal to the equivalent resistance of the network. The equivalent resistance of a two terminal network is equal to the open circuit voltage divided by the short circuit current. PROCEDURE: 1. Check the values of the resistors using the multimeter. Record the values in Table 1. 2. Connect the circuit of Figure 1. R47 10V 6.8 KQ R49 R₁ = 10 KO Prepared by Course Instructor: Maha Al-Sadoon R45 5.6 ΚΩ Figure 1 R51 20 KQ R43 5.1 ΚΩ 5V Pg. 3
ROCEDURE: . Check the values of the resistors using the multimeter. Record the values in Table 1. . Connect the circuit of Figure 1. R47 10V 6.8 Kn R49 A R₁ = 10 Kn B R45 5.6 ΚΩ Figure 1 R51> 20 KO R43 5.1 Kn 5V
3. Remove R₁ from the original circuit and measure the open circuit voltage Voc- 4. Measure the short circuit current Ise. This is accomplished by placing an Ammeter between A and B. In this manner, the Ammeter will act as a short circuit. 5. Replace the voltage sources with short circuits. With R, removed from the circuit, measure RT, using a multimeter. 6. Record the results in Table 2. REPORT: 1. Draw the Thevenin's and Norton's equivalent circuit obtained experimentally. 2. Compare step 1 with theoretical Thevenin and Norton's equivalent circuits obtained in prelab. Resistor R₁ Nominal value (Ohm) 6.8 kΩ Ohmmeter reading Theory Experiment % Error Thevenin's and Norton's Equivalent Circuits: Voc R₂ 10 kn Thevenin's Equivalent Circuit Table 4 Table 2 Resistor Values R3 5.6 k Isc R4 20 ΚΩ RT Norton's Equivalent Circuit Rs 5.1 k