Ability to obtain and analyze the Thevenin equivalent circuit: Electronic Assignment, MMU, Malaysia

Objective:

To characterize multiple resistive networks by its Thévenin’s equivalent circuit.

 Learning Outcome:

Ability to obtain and analyze the Thevenin equivalent circuit.

Theory:

 Thévenin’s Theorem: It is a process by which a complex circuit is reduced to an equivalent series circuit consisting of a single voltage source (V_TH), a series resistance (R_TH), and a load resistance (R_L). After creating the Thévenin Equivalent Circuit, the load voltage V_L or the load current I_L may be easily determined.

One of the main uses of Thévenin’s theorem is the replacement of a large part of a circuit, often a complicated and uninteresting part, with a very simple equivalent. The new simpler circuit enables us to make rapid calculations of the voltage, current, and power that the original circuit can deliver to a load. It also helps us to choose the best value of this load resistance for maximum power transfer.

                         Figure 7.1

                                                               Figure 7.2

Maximum Power Transfer Theorem states that an independent voltage source in series with a resistance R_S or an independent current source in parallel with a resistance R_S delivers maximum power to that load resistance R_L for which R_L = R_S.

In terms of a Thévenin Equivalent Circuit, maximum power is delivered to the load resistance R_L when R_L is equal to the Thévenin equivalent resistance R_TH of the circuit.

                                                                                            Figure 7.3

Task 1: Verifying Thévenin’s theorem 

Answer

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