To introduce the concepts of electrical circuits and its components
To understand magnetic circuits, DC circuits and AC single phase & three phase
circuits
To study and understand the different types of DC/AC machines and Transformers
To import the knowledge of various electrical installatio...
BASICS OF ELECTRICAL ENGINEERING (BEE)
DC CIRCUITS
Sources (or) Active elements
Passive elements(R,L,C)
OHM’s law
KCL & KVL
Series circuits NAVARATANA of BEE
Parallel circuits
Voltage division rule
Current division rule
Source transformation technique
Nodal analysis
Mesh analysis
THEVININ’S THEOREM
NORTON’S THEOREM
SUPER POSITION THEOREM
VOLTAGE(V):- potential difference between any two points is voltage. Units are
“volts” represented with “V”.
CURRENT(I):- the flow of electrons in a conductor is current. Units are “amperes”
represented with “I”.
POWER(P):- the product of voltage and current is the power. Units are “watts”
represented with “P”
P=V*I
Explain about active elements (or) source in a circuit?
Active elements (or) Sources: which energies the circuit .
, VDVS: VOLTAGE DEPENDENT VOLTAGE SOURCE
VDCS: VOLTAGE DEPENDENT CURRENT SOURCE
CDVS: CURRENT DEPENDENT VOLTAGE SOURCE
CDCS: CURRENT DEPENDENT CURRENT SOURCE
SYMBOLs:-
+ + +
- V=avx - V=bix V=cix - I=dix
VOLTAGE CURRENT
VDVS VDCS CDVS CDCS
SOURCE SOURCE
Differentiate ideal and practical sources?
Explain about ideal source? Explain about practicl source?
IDEAL SOURCE:-The sources have zero PRACTICAL SOURCE:-The sources
operational losses. have operational losses depends on
Voltage source have resistance zero(R=0) resistance & operational time.
current source have resistance zero(R=∞)
V I R
R=0 V I
+ +
V- I R=∞ V
- R
Voltage source I current source V Voltage source current source V
I
,Write a short note on passive elements? relations with Voltage,current &Power?
Passive Elements :-
Resistance(R):-
the element which oppose the flow of current(i) in the circuit
it dissipates power in the form of heat
the units of resistor is OHM‟s (Ω).
It denoted with letter “R”
By ohm‟s law V = I*R or Resistance(R)
Note:- here the resistor value is 4.7KΩ(4.7*1000 = 4700Ω)
Inductor(L):-
the element which oppose the sudden change in flow
of current(di/dt) in the circuit
INDUCTOR(L)
it store power in the form of magnetic field
the units of INDUCTOR is HENRY(H).
Note:- here the inductor value is
It denoted with letter “L”
100mH(100/1000 = 0.1H)
or
CAPACITOR(C):-
the element which oppose the sudden change in
Voltage(dv/dt) of the circuit
it store power in the form of electric field
Note:- here the capacitor value is
the units of CAPACITOR is HENRY(H).
(470*10-6 = 0.47mf [or]
It denoted with letteVr “L”
0.00047F )
or
elements
Resistance Inductor capacitor
Parameter
1
V Ldi dt
C
VOLTAGE V=I*R V Idt
1 dv
L
CURRENT I V I Vdt I c
R dt
1 1
POWER P V * I I 2R V 2 R P LI 2 P CV 2
2 2
, OHM‟s law :
At constant temperature current flowing through a
conductor is directly proportional to applied voltage
then
Resistance Is always depends on the 3 parameters
length(L),area(A) and specific resistance(ρ) of a conductor
Kirchhoff’s Voltage Law(KVL) :-
Algebraic sum of voltages in a closed loop is zero
+ V1=2v -
+
VS =9v V2=4v
-
+ V3=3v -
Kirchhoff’s Current Law(KCL) :-
I4
I
Algebraic sum of currents at a node is zero
I3 I2 I1
Series Circuit:
In series circuit the current is same and voltage
is divide.
The equivalent resistance of series circuit is
Beside circuit
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