Similarities between magnetic circuit and electric circuit
Answers
Explanation:
BASIS MAGNETIC CIRCUIT ELECTRIC CIRCUIT
Definition The closed path for magnetic flux is called magnetic circuit. The closed path for electric current is called electric circuit.
Relation Between Flux and Current Flux = mmf/reluctance Current = emf/ resistance
Units Flux φ is measured in weber (wb) Current I is measured in amperes
MMF and EMF Magnetomotive force is the driving force and is measured in Ampere turns (AT)
Mmf =ʃ H.dl Electromotive force is the driving force and measured in volts (V)
Emf = ʃ E.dl
Reluctance and Resistance Reluctance opposes the flow of magnetic flux S = l/aµ and measured in (AT/wb) Resistance opposes the flow of current
R = ρ. l/a and measured in (Ώ)
Relation between Permeance and Conduction Permeance = 1/reluctance Conduction = 1/ resistance
Analogy Permeability Conductivity
Analogy Reluctivity Resistivity
Density Flux density B = φ/a (wb/m2) Current density J = I/a (A/m2)
Intensity Magnetic intensity H = NI/l Electric density E = V/d
Drops Mmf drop = φS Voltage drop = IR
Flux and Electrons In magnetic circuit molecular poles are aligned. The flux does not flow, but sets up in the magnetic circuit. In electric circuit electric current flows in the form of electrons.
Examples For magnetic flux, there is no perfect insulator. It can set up even in the non magnetic materials like air, rubber, glass etc. For electric circuit there are a large number of perfect insulators like glass, air, rubber, PVC and synthetic resin which do not allow it to flow through them.
Variation of Reluctance and Resistance The reluctance (S) of a magnetic circuit is not constant rather it varies with the value of B. The resistance (R) of an electric circuit is almost constant as its value depends upon the value of ρ. The value of ρ and R can change slightly if the change in temperature takes place
Energy in the circuit Once the magnetic flux sets up in a magnetic circuit, no energy is expanded. Only a small amount of energy is required at the initial stage to create flux in the circuit. Energy is expanding continuously, as long as the current flows through the electrical circuit.
This energy is dissipated in the form of heat.
Applicable Laws Khirchhoff flux and mmf law is followed Khirchhoff voltage and current law is followed. (KVL and KCL)
Magnetic and Electric lines Magnetic lines of flux starts from North pole and ends at South pole. Electric lines or current starts from positive charge and ends on negative charge.
Magnetic Circuit
The closed path followed by magnetic lines of forces or we can say magnetic flux is called magnetic circuit. A magnetic circuit is made up of magnetic materials having high permeability such as iron, soft steel, etc. Magnetic circuits are used in various devices like electric motor, transformers, relays, generators galvanometer, etc.
Electric Circuit
The rearrangement by which various electrical sources like AC source or DC source, resistances, capacitance and another electrical parameter are connected is called electric circuit or electrical network.
The Answer is:
The magnetic circuit is the close path for the magnetic flux.
The electric circuit is the close path for the electric current.
- The magnetic flux is determined by the number of magnetic lines of force.
- The current flowing through the conductor is determined by the flow of electrons.
- MMF is the magnetic circuit's driving force. MMF is measured in ampere-turns (AT).
- The driving force in an electric circuit is EMF. EMF is measured in volts (V).
- The magnetic route to the flux opposes the reluctance (S). AT/wb is the unit of reluctance.
- The flow of electricity is opposed by resistance (R). The ohm () is the unit of resistance.
- Kirchhoff's MMF Law and Flux Law apply to Magnetic Flux.
- The Kirchhoff Current Law (KCL) and Kirchhoff Voltage Law (KVL) apply to an electrical circuit.
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