Steps to calculate Thevenin’s equivalent circuit.
 Remove the load resistance.
 After short circuiting all the voltage sources and open circuiting all current sources, find the equivalent resistance (R th) of the circuit, seeing from the load end.
 Now, find V th by usual circuit analysis.
 Draw Thevenin’s equivalent circuit with V th, R th and load. …
What are the advantages of using Thevenin theorem?
Thevenin’s theorem can be used as a circuit analysis method and is especially useful if the load is to take a series of different values. It is not as powerful as Mesh or Nodal analysis in larger networks because the use of Mesh or Nodal analysis is usually necessary for any Thevenin exercise, so it might well be used from the start.
How do you find the equivalent expression?
equivalent expressionshave the same value but are presented in a differentformat using the properties of numbers eg, ax + bx = (a + b)x are equivalent expressions. Strictly, they are not "equal", hence we should use 3 parallel lines in the"equal" rather than 2 as shown here.
How to solve Thevenin circuits?
Thevenin’s Theorem Solved Example. Find V TH, R TH and the load current I L flowing through and load voltage across the load resistor in the circuit below using Thevenin’s Theorem.. Solution: Step 1: Remove the 5 kΩ from the circuit. Step 2: Measure the opencircuit voltage.This will give you the Thevenin’s voltage (V TH).. Step 3: We calculate Thevenin’s voltage by determining the ...
How to use Thevenin theorem on circuit?
 Identify the load resistance value of RL
 Remove the load resistance and calculate the open circuit potential across the two open ends. ...
 Again remove the load resistance and replace all active sources with their internal resistance and find Rth – If we find the equivalent resistance then there is no need of ...
How do you find Thevenin equivalent resistance?
Thevenin's Theorem in Action Find the Thevenin Resistance by removing all voltage sources and load resistor. Find the Thevenin Voltage by plugging in the voltages. Use the Thevenin Resistance and Voltage to find the current flowing through the load.
How do you calculate RTH and VTH?
1:5112:19Thevenin's circuit, finding Vth and Rth network theory  GATE and IESYouTubeStart of suggested clipEnd of suggested clipYou have the function relating il with the I th and RL + v th. So you don't have to worry about theMoreYou have the function relating il with the I th and RL + v th. So you don't have to worry about the changed value of RL. You just have to put the new value and you will get the new value of IL. If.
How do you calculate Vth in Thevenin?
This is the equivalent Thevenin circuit of that linear electric network or complex circuit which had to be simplified and analyzed by Thevenin's Theorem. You have done it. Now find the Total current flowing through the load resistor by using the Ohm's Law: IT = VTH / (RTH + RL).
What is VTH and RTH Thevenin equivalent Vth?
Thévenin equivalent circuit represents a general circuit in a form of an independent voltage source Vth with a since resistance Rth. To find Vth and Rth. First, we assume that the load resistor is infinite. ( Open circuit)
What is Thevenin's theorem formula?
Any combination of batteries and resistances with two terminals can be replaced by a single voltage source e and a single series resistor r. The value of e is the open circuit voltage at the terminals, and the value of r is e divided by the current with the terminals short circuited.
What is the formula for RTH?
This is it, the final result is obtained by assembling the pieces as follows: Rth=Rref1+R5Rn1+R5Rd. The below Mathcad file shows the exact formula and a resistance computed to 2.875Ω. You can see how easy it is to apply the EET which is part of the fast analytical techniques (FACTs) toolkit.
How do you solve the Thevenin and Norton equivalent circuit?
8:2211:05Norton's Theorem and Thevenin's Theorem  Electrical Circuit AnalysisYouTubeStart of suggested clipEnd of suggested clipAnd to calculate the current flowing through rl is going to be the norton. Current times rn over rnMoreAnd to calculate the current flowing through rl is going to be the norton. Current times rn over rn plus rl.
Is RTh is equal to RN?
2. The Norton equivalent resistance (RN) is equal to the Thévenin equivalent resistance (RTh).
How do you find the rth of a dependent source?
3:007:51Thevenin's Theorem with Dependent Sources  YouTubeYouTubeStart of suggested clipEnd of suggested clipThe Thevenin equivalent resistance rth and we know that in order to calculate. Rth. We need to turnMoreThe Thevenin equivalent resistance rth and we know that in order to calculate. Rth. We need to turn off all the independent sources. We have this independent source present in the net.
How do you find the Vth in Multisim?
To find VTH, the voltage between terminals A and B with no load attached, we will simply insert a DMM in Multisim to measure the voltage drop directly as shown in Figure 2. The same DM M can also be used to measure Isc, simply by putting it into current mode.
How does Multisim calculate rth?
4:195:42how to find Rth and Vth using Multisim 11  YouTubeYouTubeStart of suggested clipEnd of suggested clipOkay so there you have it we found v thevenin to be 90 volts. So which is similar well which isMoreOkay so there you have it we found v thevenin to be 90 volts. So which is similar well which is equal to the calculations that i had in the previous circuit that we had done the previous.
What is difference between Thevenin and Norton theorem?
What is the difference between Thevenin and Norton theorems? – Norton's theorem uses a current source, whereas Thevenin's theorem uses a voltage source. – Thevenin's theorem uses a resistor in series, while Norton's theorem uses a resister set in parallel with the source.
How to find thevenin equivalent?
Finding Thevenin Equivalents in Practice 1 Find V th by measuring the open circuit voltage with a multimeter. 2 Find R th by connecting a current meter to the two terminals and dividing V th by the measured current (called a shortcircuit current). Note that this isn’t the safest method and should never be used in practice! A safer and more proper method for finding R th is outlined in Lab 3. That is, find a load resistance that produces a noticeable drop in the load voltage. Then find R th by applying the voltage divider formula.
Why is finding the Thevenin equivalent more difficult?
In theory, finding the Thevenin equivalent is more difficult because we can’t rely on lab equipment to do the work for us. On paper, the Thevenin equivalent resistance (R th) is easier to find. 1. If there is a load, remove it – Remember that Thevenin’s theorem applies to two terminal circuits.
What is Thevenin's theorem?
Thevenin’s theorem states that a two terminal circuit containing voltage sources, current sources, and resistors can be modeled as a voltage source in series with a resistor. The benefit of using a Thevenin equivalent is that it makes analyzing how a circuit interacts with other circuits a much simpler process.
How many voltage dividers can be used to solve a circuit?
Once we have the equivalent circuit, the problem can be solved using three simple voltage dividers.
Is Thevenin's equivalent fun?
See, Thevenin’s Equivalent is a lot of fun! Get good at this and you have mastered quite a few important engineering concepts! Thanks to Ryan Eatinger (reatinge@ksu.edu) for contribution of this lesson.
What is the circuit of Thevenin equivalent?
Thevenin equivalent circuit has a single loop. If we apply a KVL (Kirchhoff’s Voltage Law) to this loop, we can find the current passing through the load.
How to calculate Thevenin equivalent resistance?
To calculate the Thevenin equivalent resistance, remove all power sources from the original circuit. And voltage sources are shortcircuited and current sources are opened. Hence, the remaining circuit has only resistances. Now, calculate the total resistance between the open connection points across load terminals.
What is Thevenin’s Theorem (Thevenin Equivalent)?
Thevenin theorem (also known as the Helmholtz–Thévenin theorem) states that any linear circuit containing only voltage sources, current sources, and resistances can be replaced by an equivalent combination of a voltage source (V Th) in series with a single resistance (R Th) connected across the load. This simplified circuit is known as the Thevenin Equivalent Circuit.
What is the Thevenin equivalent circuit?
This simplified circuit is known as the Thevenin Equivalent Circuit. Thevenin’s theorem was invented by a French engineer Léon Charles Thévenin (hence the name). Thevenin theorem is used to convert a complex electrical circuit to a simple twoterminal Thevenin equivalent circuit. A Thevenin equivalent circuit contains one Thevenin resistance ...
What is the V EQ?
Thevenin equivalent voltage ( V eq) is equal to the opencircuit voltage measured across two terminals of load. This value of the ideal voltage source is used in Thevenin equivalent circuit.
How to find equivalent resistance?
The equivalent resistance is calculated by making series and parallel connection of resistances. And find a value of equivalent resistance. This resistance is also known as Thevenin resistance (R th ).
How to find current I 1 and I 2?
By solving equation3 and 4; we can find the value of current I 1 and I 2. And current I 1 is the current that we need (I SC ).
How to determine Thevenin equivalent resistance?
Step 1: Identify the portion of the network for which you require the Thevenin Equivalent circuit. Label the two terminals as points A and B and remove the portion not being included in the reduction. (ie. the load) Step 2: Determine the Thevenin equivalent resistance (Rth) by short circuiting all voltage sources, ...
What is the utility of the Thevenin theorem?
As an example of the utility of this theorem consider the testing of any power generation equipment. One of the key aspects of such a test exercise illustrates the usefulness of being able to make multiple calculations pertaining to varying load conditions easily. A resistive or unity power factor load bank is a device that is designed to provide scalable loads and is used during testing of power generation equipment. To calculate expected values under the relevant series of load conditions can be tedious. Thevenin's circuit reduction approach simplifies it. Not only can this approach be applied to larger scale power generation applications, it applies to something as simple as testing automotive batteries for high load usage during the turning over of the engine as opposed to other expected operating conditions
How to calculate Thevenin voltage?
This will give you the Thevenin’s voltage (V TH ). Step 3: We calculate Thevenin’s voltage by determining the current that flows through 12 kΩ and 4 kΩ resistors.
What is the voltage of the Thevenin?
8 kΩ is parallel to the 4 kΩ, so the same voltage will appear across the 8 kΩ resistors too. Therefore, 12 V will appear across the AB terminals. Therefore, the Thevenin’s voltage, V TH = 12 V.
What is Thevenin's theorem?
Thevenin’s theorem states that it is possible to simplify any linear circuit, irrespective of how complex it is, to an equivalent circuit with a single voltage source and a series resistance.
Which theorem is used to calculate current and voltage?
Thevenin's Theorem. Most commonly, we use Ohm’s law, Kirchoff’s law to solve complex electrical circuits, but we must also be aware that there are many circuit analysis theorems from which we can calculate the current and voltage at any given point in a circuit. Among the various circuit theorems, Thevenin’s theorem is most commonly used.
Is Thevenin's theorem applicable to nonlinear circuits?
No, Thevenin’s Theorem is not applicable to nonlinear circuits.
Is Thevenin equivalent the same as real system?
The power dissipation of the Thevenin equivalent is not identical to the power dissipation of the real system.
How to calculate Thevenin's equivalent circuit?
Steps to calculate Thevenin’s equivalent circuit. 1 Remove the load resistance. 2 After short circuiting all the voltage sources and open circuiting all current sources, find the equivalent resistance (R th) of the circuit, seeing from the load end. 3 Now, find V th by usual circuit analysis. 4 Draw Thevenin’s equivalent circuit with V th, R th and load. From this circuit we can calculate I L for different values of load resistance.
Why is Thevenin's theorem important?
Thevenin’s theorem is very important in circuit analysis, power system analysis, short circuit calculations and is a key tool for circuit design. Thevenin’s circuit is a simplified form of a large circuit containing multiple power sources and resistances.
What is the difference between a V TH and a R TH?
Simply, Thevenin’s theorem states that any linear network with several power sources, resistances and a variable load can be represented in a much simpler circuit containing a single voltage source (V TH ) (known as Thevenin’s equivalent voltage) in series with a resistance (R TH) (known as Thevenin’s equivalent resistance) and the variable load, where V TH is the opencircuit voltage at the terminals of the load and R TH is the equivalent resistance measured across the terminals while independent sources are turned off. See the below figure for better understanding.
Does Thevenin have an open circuit?
While calculating the thevenin’s equivalent resistance, all voltage sources must be turned off, meaning it acts like a short circuit and all current sources act like an open circuit, as shown in the figure below:
How to find Thevenin equivalent resistance?
To obtain the resistance RTH– called the Thevenin’s equivalent resistance of circuit A: i) Remove circuit B from circuit A. ii) Set all independent sources in circuit A to zero.
How to get voltage voc?
To obtain the voltage Voc– called the open circuit voltage remove circuit B from circuit A, and determine the voltage between node a and b ( where the + is at node a). This voltage, as shown in figure 3 (a), is Voc.
Can method 1 be used to find equivalent resistance?
Now, we have dependent source, so method 1 cannot be used for finding Equivalent resistance Rth. Either Method 2 or Method 3 can be utilized here. We will prefer to employ second method. Terminals a and b are to be shorted as shown in the following figure and V2 = 0.
Thevenin’s Theorem
Finding Thevenin Equivalents in Practice

By using the Thevenin equivalent model, the problem was solved without the need to perform a full circuit analysis each time the load changed. However, you must learn how to acquire Thevenin equivalents before you can take advantage of them. In practice, finding the Thevenin equivalent of a circuit is simple. 1. Find Vthby measuring the open circui...
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Thevenin Equivalent Resistance

In theory, finding the Thevenin equivalent is more difficult because we can’t rely on lab equipment to do the work for us. On paper, the Thevenin equivalent resistance (Rth) is easier to find. 1. If there is a load, remove it – Remember that Thevenin’s theorem applies to two terminal circuits. This implies that the circuit is unloaded (see Figure 4). After all, Vthis equal to the open circuit v…
Thevenin Equivalent Voltage

Any of the circuit analysis techniques learned so far can be used to find the Thevenin equivalent voltage (Vth). Voltage dividers, branch currents, node voltage, superposition, and source transformations (the last two will be covered soon) are all legitimate methods for finding Vth. Of the two Thevenin equivalent values, Vthtends to be the harder one to find because there is no on…