What is Thevenin's theorem?

Thevenin's theorem simplifies complex circuits by using equivalent voltage sources and resistors. The specific steps are: 1) Calculate the equivalent resistance between terminals (Rth); 2) Calculate the open circuit voltage (Voc); 3) Create an equivalent circuit where the equivalent voltage source is Voc and the equivalent resistance is Rth. This equivalent circuit produces the same voltage and current between terminals as the original circuit and has a wide range of applications, including circuit simplification, impedance determination, power supply design, and feedback loop analysis.

Thevenin's theorem

Thevenin's theorem is a theorem used in electricity to solve complex circuits. It describes how to use equivalent voltage sources and resistors to equate a complex circuit containing multiple voltage sources and resistors.

Specifically, Thevenin's theorem reads as follows:

Step 1:

• Replace all voltage sources with short circuits while maintaining Other components remain unchanged.
• Find the equivalent resistance between terminals a and b. Denoted as Rth.

Step 2:

• Reconnect all voltage sources but not the test load.
• Find the open circuit voltage between terminals a and b. Recorded as Voc.

Step 3:

• Use the Rth and Voc obtained above to form an equivalent circuit, where:
• Equivalent voltage source: Voc
• Equivalent resistance: Rth

This equivalent circuit can completely replace the original complex circuit and combine the two The same voltage and current are generated between the terminals.

Application:

Thevenin's theorem is widely used in circuit analysis and design:

• Simplify the circuit to make it easier to solve.
• Determine the input or output impedance of the circuit.
• Design power supply and amplifier circuits.
• Analyze feedback loops and stability.

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