Basic Electronics [2110016]

1. Sardar Patel College
Of Engineering
Topic:- Thevenin’s and Nortan’s Theorems
Sub :- Basic Electronics - 2110016

2. Student name Enrollment no.
Dhaval Patel 161240107011
Meet Kakadiya 161240107013
Akshay Kalola 161240107014
GUIDE BY :-
PROF. :- TOSIF BABU SIR

3. Introduction
 Thevenin’s Theorem is a very important and useful theorem.
 • It is a method for the reduction of a portion of a complex
circuit into a simple one.
 • It reduces the need for repeated solutions of the same sets of
equations.

4. Thevenin Equivalent Circuit
 Any two-terminal linear network, composed of voltage sources,
current sources, and resistors, can be replaced by an equivalent
two-terminal network consisting of an independent voltage
source in series with a resistor.

5. Finding Vth and Rth
Open circuit across terminals
i = 0, v = Voc = vth
Calculate the open- circuit voltage
in the original network,

6. Thevenin Equivalent - Example
 Find the Thevenin equivalent with respect to terminals a,b.

7. Alternative Method of finding Rth
--for circuits containing dependent sources
1. Set all independent
sources to zero
2. Apply either a test
voltage source v0 (or a test
current source i0) to the terminals
3. Calculate i0 (or v0 )

8. Thevenin Equivalent - Example
 Find the Thevenin equivalent of the following circuit. If a 10Ω
resistor is connected between the terminals, what current will
flow in it?

9. Norton's Theorem
 Any collection of batteries and resistances with two terminals is electrically
equivalent to an ideal current source i in parallel with a single resistor r.
The value of r is the same as that in the Thevenin equivalent and the
current i can be found by dividing the open circuit voltage by r.

10. Theory
 The Norton equivalent circuit is a current source with current
"INO" in parallel with a resistance RNO.To find its Norton
equivalent circuit,
 Find the Norton current "INO". Calculate the output current,
"IAB", when a short circuit is the load (meaning 0 resistances
between A and B). This is INo.

11. Theory
 Find the Norton resistance RNo. When there are no dependent
sources (i.e., all current and voltage sources are independent),
there are two methods of determining the Norton impedance
RNo.

12. http://vlab.amrita.edu
https://courseware.ee.calpoly.edu
https://en.wikipedia.org/wiki/Nort
on%27s_theorem
Reference