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Advantages of AC over DC
AC easily transform voltage (i
...
step up or step down)
AC is efficient for sending high voltage to long distance
Losses in AC are less during transformation than DC
Conversion of AC to DC is easy and cheaper
It is easily available
It is less harmful
More voltage can be generated, more power transmitted with
less current loss
CURREN
Flow of electrons inside a conducting material (conductor) is called
as current
Unit = Ampere
I=Q/t
...
I=Q/t
(An Ampere is a unit of measure of the rate of electron flow OR
current in an electric conductor)
1 Ampere of current represent 1 coulomb of electric charge
(6
...
Unit= coulomb
…Q=It
1 coulomb= amount of electric charge carried by a current of 1
Ampere flowing for 1 second
...
(either in circuit or in neighboring circuit)
L = (N x φ)/ I
Unit = Henry
Insulator
Insulators are the materials that resist the transfer of either
heat or electricity
It is used as a protecting device
What is Electricity
Movement of charge particles inside a wire or conductor is
called as current or electricity which used to work varies electrical
appliances in domestic, comertial etc
What is Energy
Movement of charge particles through wire from power plant to
home
Unit = Joules
What is Force
In physics = energy given to object for its movement
In electrical = Attractive or Repulsive interaction between two
charged particles or objects called Electric force
What is Torque
Torque is the tendency of force to rotate a body about its axis
...
watt
Real power (Active)
Power consume by the resistive component in the circuit
P= VI cosφ
Appearant Power
Total power consumed by resistive circuit
P=VxI
Reactive Power
Power consume by inductive and capacitive load in circuit
P = V x I sinφ
Reactance
It is opposition to change in current or voltage from circuit
element due to their inductance or capacitance
Symbol = X
Impedence = it is contribution of both resistance and reactance(Z)
Inductive reactance
It is effective resistance offer by inductive coil
XL = 2∏fL
Capacitive reactance
It is effective resistance offer by capacitive coil Xc=2∏fc
Magnetic field strength
It is also called as magnetic field intensity
H = Ampere turns/ length in meter
H = AT/m or N/Wb
or Ampere/meter
What is Permeability
Ability of material to carry the flux lines
Eg
...
I unit of power is Watt
Electric pressure is also called as Voltage
The resistance of a conductor varies inversely as area of cross
section
Ohms law is not applicable to semi conductors
An ideal voltage source should have zero source resistance
For a voltage source terminal voltage cannot be higher than
source emf
Inductance is the non linear ckt parameter
A network which contain one or more than one source of emf is
known as active network
The rms value and mean value is same in the case of square wave
For a sin wave with peak value Imax the rms value is 0
...
11
For a frequency of 200Hz, the time period will be 0
...
C
...
C ckt also apply to A