In this post we will learn the Basics of Thevenin Theorem and the Equivalent Circuit of Thevenin Theorem along with the Applications and Limitations of Thevenin Theorem.

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According to Thevenin's Theorem, any linear electrical network having voltage sources, current sources and resistances only, can be replaced by an equivalent voltage source (Thevenin's voltage or Vth) in series connection with an equivalent resistance (Thevenin's resistance or Rth).

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The Thevenin's equivalent voltage (thevenin's voltage, Vth) is the voltage that is obtained at any terminals A-B of the network, with these terminals open circuited.

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The equivalent resistance (Thevenin's resistance, Rth) which is also known as Norton's resistance, is the resistance between the terminals A-B, when all the ideal voltage sources in the circuit are short circuited and all the ideal current sources are open circuited.

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With the help of Thevenin's Theorem, it is possible to replace a complex part of the network by a very easy equivalent series circuit.

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1. Thevenin Theorem is not applicable to the circuits that contain nonlinear elements like transistors and diodes etc.

2. It is not applicable to the circuits having unilateral elements like diode etc.

3. Thevenin's Theorem cannot be used for the circuits that contain magnetic coupling between load and any other circuit element.

4. It is Not possible to apply the thevenins theorem to the circuits containing load in series or parallel with controlled or dependent sources.

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**Thevenin Theorem Explained Video**

**Thevenin Theorem Explained Video**

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__Thevenin Theorem__

According to Thevenin's Theorem, any linear electrical network having voltage sources, current sources and resistances only, can be replaced by an equivalent voltage source (Thevenin's voltage or Vth) in series connection with an equivalent resistance (Thevenin's resistance or Rth).##
__Thevenin Equivalent Voltage (Vth)__

The Thevenin's equivalent voltage (thevenin's voltage, Vth) is the voltage that is obtained at any terminals A-B of the network, with these terminals open circuited.##
__Thevenin Equivalent Resistance (Rth)__

The equivalent resistance (Thevenin's resistance, Rth) which is also known as Norton's resistance, is the resistance between the terminals A-B, when all the ideal voltage sources in the circuit are short circuited and all the ideal current sources are open circuited.__Thevenin Equivalent Resistance (Rth)__

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__Applications of Thevenin Theorem__

With the help of Thevenin's Theorem, it is possible to replace a complex part of the network by a very easy equivalent series circuit.__Applications of Thevenin Theorem__

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__Limitations of Thevenin Theorem__

1. Thevenin Theorem is not applicable to the circuits that contain nonlinear elements like transistors and diodes etc.__Limitations of Thevenin Theorem__

2. It is not applicable to the circuits having unilateral elements like diode etc.

3. Thevenin's Theorem cannot be used for the circuits that contain magnetic coupling between load and any other circuit element.

4. It is Not possible to apply the thevenins theorem to the circuits containing load in series or parallel with controlled or dependent sources.

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