1. To verify the Thevenin’s theorem through an experiment. 2. To find the Thevenin’s resistance RTH by various methods and compare values.
Equipment:
Resistors, DMM, breadboard, DC power supply, and connecting wires.
Theory:
Thevenin theorem states that any linear twoterminal circuit can be replaced by an equivalent circuit consisting of a voltage source VTH in series with a resistance RTH where
* VTH is the opencircuit voltage at the terminals, and
* RTH is the equivalent resistance seen thru the terminals provided that all the independent sources are turned off.
Finding VTH:
Determining the output voltage Vab in opencircuit condition (no load resistor meaning infinite resistance). This is known as the Thevenin voltage VTH. * i.e. VTH = Vab = VOC (opencircuit voltage)
Finding RTH:
There are different methods to find value of RTH as described below.
1. Method A:
(By measuring ISC – shortcircuit current)

Short the points ‘a’ and ‘b’, then measure the shortcircuit current Isc using an ammeter. Calculator RTH as follows
RTH = VTH/ ISC
Method 2:
(By measuring the equivalent resistance)
Remove all sources from the circuit, i.e. replace all voltage sources with a shortcircuit and current sources with an opencircuit. Then with the help of a multimeter find the resistance between the points ‘a’ and ‘b’, denoted by Req.
RTH = Req
Method 3:
(By applying known voltage and measuring source current).
We can also find RTH by applying a known voltage to the circuit between points ‘a’ and ‘b’, then measuring the current from the voltage source. Suppose 1 Vdc is applied as the test voltage then,
RTH = Vtest / I
4. Method 4:
(By inserting two different resistors and measuring current) There is another method to find the value of RTH, by inserting two different loads between points ‘a’ and ‘b’ i.e....
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Proportionality is a way to relate two quantities together. This means that when more input is supplied, you get more output which is proportional to the input.
The Proportionality Theorem states that the response in a circuit is proportional to the source acting in the circuit. This is also known as Linearity. The proportionality constant (K)...
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The Thevenin’stheorem, as applied to d.c. circuits, may be stated as under:
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...Application
There are some applications of Thevenin’sTheorem in our daily lives. Thevenin’sTheorem is very useful to reduce a network with several voltage sources and resistors to an equivalent circuit composed a single voltage source and a single resistance connected to a load only. It is used in simplifying and analysing complex linear networks power systems and circuits where one particular where a particular load resistor, RL in...
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Superposition Theorem
Superposition Theorem states that the response in a linear circuit with multiple
sources can be obtained by adding the individual responses caused by the separate independent sources acting alone.
For an independent...
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Table of Contents
Background…………………………………………………………………………………………
Introduction………………………………………………………………………………………..
Objective……………………………………………………………………………………………
Methodology………………………………………………………………………………………
Literature...
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