Definition: Thevenin’s Theorem states that it is possible to simplify any linear circuit, no matter how complex, to an equivalent circuit with just a single voltage source and series resistance connected to a load.
Four steps to follow for Thevenin’s Theorem:
1. Find the Thevenin source by removing the load resistor in the original circuit.
2. Find the Thevenin resistor (RTH) by removing all power sources in the original circuit (voltage sources shorted and current sources open) and calculating total resistance between the open points of the equivalent circuit.
3. Find Thevenin voltage (VTH) across the open connection points where the load resistor used to be.
4. Draw the Thevenin equivalent circuit, with the Thevenin Voltage (VTH) source in series with the Thevenin resistance (RTH). The load resistor (RL) re-attaches between the two open points of the equivalent circuit.
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