Statement: An active complex network can be replaced by a simple two-terminal network consisting of a constant voltage source VTH in series with a resistance RTH where VTH is the open-circuit voltage between terminals of the load with load removed and RTH is the resistance of the network measured between terminals of load with load removed and other sources replaced by their internal resistances.
Explanation: Consider a network shown in fig.
Step 1: To Find VTH
Remove the branch resistance through which current is to be calculated. Calculate voltage across these open circuited terminals, by using any of the network simplification techniques (using KVL). This is VTH.
Step II: To Find RTH
Calculate RTH by removing branch resistance and replacing all independent sources by their internal resistances. If the value of internal resistance is not known then replace the voltage source by short circuit & current source by an open circuit.
Step III: Draw Thevenin’s equivalent showing source VTH, with the resistance RTH in series with it, across the terminals of branch. Reconnect the branch resistance let it be RL . The required current through the branch AB is given by,
has high efficiency
Explanation of Superposition theorem.
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