#ChapterCloseTech Difference between Electrical & Magnetic circuit. One liner MCQ आयेगा ही आयेगा। Let’s start with the different points from both circuit,
Sr.No. Content Electrical Circuit Magnetic Circuit
1 Basic Difference In an electrical circuit, electric current flows through the path. In the magnetic circuit, magnetic flux flows through the path.
2 Definition
(Symbol, Unit & Formula)
The number of free electrons or electric charge particles move in the circuit is called ‘Electric Current’.
It denoted by ‘I’.
The S.I. unit is ‘A’ (Ampere).
The formula of Current,
I=(EMF/R)=(V/R)
The number of magnetic lines of the force passing through a magnet is called’Magnetic Flux’.
It denoted by‘ɸ’.
The S.I. unit is ‘Wb’ (Weber).
The formula of Flux,
ɸ=(MMF/S)
3 Circuit Role In this circuit, electric current flows from positive to negative polarities. In this circuit, magnetic flux flows from N-pole to S-pole.
4 Force
(Symbol & Unit)
The force is necessary to move the free electron in a particular direction and produce current. this force called ‘Electromotive Force’.
Its denoted by ‘EMF’.
EMF in ‘V’ (Volt).
The force is applied to the number of magnetic field lines passing through a surface. this force called ‘Magnetomotive Force’.
Its denoted by ‘MMF’.
MMF in ‘AT’ (Ampere-turn).
5 Property I
(Opposition Property)
The properties of the substance which oppose the flow of electric current are called ‘Resistance’.
Resistance denoted by ‘R’.
The S.I. unit is ‘Ω’ (Ohm).
The formula,
R=(ρl/a)
Where ρ is Resistivity.
The properties of the substance which oppose the flow of magnetic flux are called ‘Reluctance’.
Reluctance denoted by ‘S’.
The S.I. unit is ‘AT/Wb’ (Ampere- turn/Weber).
The formula,
S=(l/µa)
Where µ is Permeability
6 Property II
(Flowing Property)
Conductance is the reciprocal of the resistance.
Its denoted by ‘G’.
The S.I. unit is ‘S’ (Siemens).
The Formula,
G=(1/R)
Permeance is the reciprocal of the reluctance.
Its denoted by ‘P’.
The S.I. unit is ‘Wb/AT’ or ‘H’(Weber/Ampere- turn or Henry).
The Formula,
p=(1/S)
7 Force
(Calculation Of Force)
Total EMF,
Ʃ (EMF)=IR1+IR2+IR3+...
Total MMF,
Ʃ (MMF)=ɸS1+ɸS2+ɸS3+...
8 Circuit’s Law According to Ohm’s Law,
I=(E/R)=(EMF/R)
According to Ohm’s Law,
ɸ=(F/S)=(MMF/S)
9 Circuit’s First Law According to Kirchhoff’s First Law,
Ʃ I =0 at a node.
According to Kirchhoff’s First Law,
Ʃ ɸ=0 at a node.
10 Circuit’s Second Law According to the Kirchhoff’s Second Law, for the closed circuit.
Ʃ (IR)= Ʃ (EMF)
According to the Kirchhoff’s Second Law, for the closed circuit.
Ʃ (ɸS)= Ʃ (MMF)
11 Density
(Symbol, Unit & Formula)
Current Density is the rate of the electric currents flowing per unit cross-sectional area of a material.
It is denoted by the ‘δ’.
The S.I. unit is A/m2
(Ampere/sq. meter).
The Formula,
δ=(I/a)
Flux Density is the rate of the magnetic fluxes flowing per unit cross-sectional area of a material.
It is denoted by the ‘B’.
The S.I. unit is Wb/m2 or T
(Weber/sq. meter or Tesla).
The Formula,
B=(ɸ/a)
12
Strength
(Symbol, Unit & Formula)
Electric Field Strength
is the Electromotive force per unit electric charge.It is known as ‘Electric Field Intensity’.It is denoted by the ‘E’.The S.I. unit is N/C or V/m
(Newton/coulomb or volt/meter).The Formula,
E=(EMF/q)
Magnetic Field Strength
is the Magnetomotive force per unit length.It is known as ‘Magnetic Field Strength’.It is denoted by the ‘H’.The S.I. unit is A/m
(Ampere/meter).The Formula,
H=(MMF/l)
13 Circuit Structure The electrical circuit can be closed or open circuit. The magnetic circuit is always a closed circuit.
14. Circuit Diagram:
Electrical Circuit
You can see the following diagram, the resistance is connected in the electrical circuit. This resistance (R) is helped to limit the producing current (i) in the electrical circuit.
Magnetic Circuit:
The same working function has done. But in the magnetic circuit, we are used reluctance (S) to limit the generating magnetic flux (Φ).
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