Electrical circuits lecture notes b. Tech

Example:
Find the value of current through R
L
 using Millman’s theorem.?
Solution: 
Given R
1
= R
2
= R
3
= 4
G = G
1
+ G
2
+ G
3
G 
= 
1
4
+
1
4
+
1
4
=
3
4
∴
R 
= 
1
G
=
4
3
Ω 
V =
V
1
G
1
+ V
2
G
2
+ V
3
G
3
G
1
+ G
2
+ G
3

---

V =
(−4)
1
4 +
(−2)
1
4 +
(10)
1
4
3
4
V =
−4 − 2 + 10
3
V =
4
3
So given circuit becomes, 
∴
I
L
=
V
R+R
L
=
4
3
4
3
+10
=
4
34
=
117.64mA
The current flowing through R
L
is 
117.64mA

---

ELECTRICAL CIRCUITS 
 
EEE 
 
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY 
UNIT-V
MAGNETIC CIRCUITS 

INTRODUCTION 

FARADAY'S LAW OF ELECTROMAGNETIC INDUCTION 

CONCEPT OF SELF & MUTUAL INDUCTANCE 

DOT CONVENTION 

COEFFIECIENT OF COUPLING 

COMPOSTE MAGNETIC CIRCUIT 

ANALYSIS OF SERIES AND PARALLEL MAGNETIC CIRCUITS 
 
INTRODUCTION 
Although the lines of magnetic flux have no physical existence, they do form a very convenient 
and useful basis for explaining various magnetic effects and to calculate the magnitudes of 
various magnetic quantities. The complete closed path followed by any group of magnetic flux 
lines is referred as magnetic circuit. The lines of magnetic flux never intersect, and each line 
forms a closed path. Whenever a current is flowing through the coil there will be magnetic flux 
produced and the path followed by the magnetic flux is known as magnetic circuit. The 
operation of all the electrical devices like generators, motors, transformers etc. depend upon 
the magnetism produced by this magnetic circuit. Therefore, to obtain the required 
characteristics of these devices, their magnetic circuits have to be designed carefully.