What are the three methods for finding equivalent resistance according to Thevenin's theorem?

There are three methods for calculating equivalent resistance using Thevenin's theorem: Voltage source short-circuit method: Calculate the parallel resistance of all branch resistances. Current source open circuit method: Calculate the equivalent resistance of the voltage source in series with all branch resistances. Ohm's law method: Connect the test voltage source, measure the current, and use Ohm's law to calculate the equivalent resistance.

Three ways to find equivalent resistance using Thevenin’s theorem

Thevenin’s theorem analyzes and simplifies complex circuits A common technique that converts a circuit into an equivalent circuit containing a voltage source and a series resistor. Solving the equivalent resistance is a key step in Thevenin's theorem. Three methods are introduced below:

The first method: voltage source short circuit method

1. Convert the voltage The source is replaced with a short circuit.
2. Calculate the parallel resistance of all branch impedances.
3. The parallel resistance is the equivalent resistance.

Second method: Current source open circuit method

1. Replace the current source with an open circuit.
2. Calculate the equivalent resistance of the voltage source in series with all branch impedances.
3. Equivalent resistance is the equivalent resistance.

Third method: Ohm’s law method

1. Connect a test voltage source to the circuit whose voltage value is known .
2. Measure the current value of the test voltage source.
3. Use Ohm's law (voltage = current × resistance) to calculate the equivalent resistance.

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