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Methods for Finding a Thévenin Equivalent Circuit a Rth Vth b Method If the circuit contains: 1 Resistors and independent sources 2 Resistors and independent and dependent sources or Resistors and independent sources 3 Resistors and dependent sources (no independent sources) Thévenin Equivalent Circuit (a) Connect an open circuit between terminals a and b. Find Voc=Vab=Vth. (b) Deactivate the independent sources (voltage source = short, current source = open). Find Rth. (a) Connect an open circuit between terminals a and b. Find Voc = Vab= Vth. (b) Connect a short circuit between terminals a and b. Find isc. Rth = Voc/isc. (c) Connect a 1 amp current source from terminal b to terminal a. Determine Vab. Then Rth = Vab/1. (a) Note that Voc = 0. (b) Connect a 1 amp current source from terminal b to terminal a. Determine Vab. Then Rth = Vab/1. Methods for Finding a Norton Equivalent Circuit a isc Rn = Rth b Method If the circuit contains: 1 Resistors and independent sources 2 Resistors and independent and dependent sources or Resistors and independent sources 3 Resistors and dependent sources (no independent sources) Norton Equivalent Circuit (a) Connect a short circuit between terminals a and b. Find isc. (b) Deactivate the independent sources (voltage source = short, current source = open). Find Rn = Rth. (a) Connect an open circuit between terminals a and b. Find Voc = Vab= Vth. (b) Connect a short circuit between terminals a and b. Find isc. Rn = Rth = Voc/isc. (c) Connect a 1 amp current source from terminal b to terminal a. Determine Vab. Then Rn = Rth = Vab/1. (a) Note that isc = 0. (b) Connect a 1 amp current source from terminal b to terminal a. Determine Vab. Then Rn = Rth = Vab/1.