Thevenin's Theorem - LBM4

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Wednesday 24 October 2018

Thevenin's Theorem

Thevenin's Theorem

Thevenin's Theorem is an analytical method used to change a complex circuit into a simple equivalent circuit consisting of  a single resistance in series with a source voltage.

Thevenin's theorem states that " a linear, active and passive two terminal circuit can be replaced by an equivalent circuit consisting of a voltage source VTh in series with a resister RTh

                                        where,
                                                   VTh is open circuit voltage at the terminals
                                                   RTh. is the input/equivalent resistance at the terminals
when independent source are turned off."
Basic procedure for solving circuit using Thevenin's Theorem:

  1. Remove temporarily the local resister RL
  2. Find RTh by shorting all voltage source and by open circuiting current sources.
  3. Find VTh by general circuit analysis.
  4. Find current flowing through the load resister RL as
                                            
                                            For example click Thevenin's theorem example

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