Thevenin Equivalent Circuit Voltage Divider. Thevenin s theorem states that a linear two terminal circuit can be replaced by an equivalent circuit consisting of a voltage source v th in series with a resistor r th where v th is the open circuit voltage at the terminals and r th is the input or equivalent resistance at the terminals when the independent sources are turned off. The thevenin resistance is the resistance looking back from ab with v 1 replaced by a short circuit.
Firstly the new voltage source it is the open circuit voltage at the junction of r1 and r2 when the base is disconnected i e. The thévenin equivalent voltage vth is the open circuit voltage at the output terminals of the original circuit. When calculating a thévenin equivalent voltage the voltage divider principle is useful by declaring one terminal to be v out and the other terminal to be at the ground point.
Replacing a network by its thevenin equivalent can simplify the analysis of a complex circuit.
The circuit on the left is the standard way to represent the voltage divider. When calculating a thévenin equivalent voltage the voltage divider principle is often useful by declaring one terminal to be vout and the other terminal to be at the ground point. May 29 2018 by michal. Replacing a network by its thevenin equivalent can simplify the analysis of a complex circuit.
