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DC sources are not used for excitation of magnetic circuit of Transformers and other AC machines. AC sources are used. The steady-state current is calculated by the applied voltage and resistance of the circuit when DC excitation is applied. The inductance in this case plays the role only for the transient part. The adjustment of the magnetic flux takes place as per the value of current to satisfy the relationship of B-H curve or magnetization curve. For the case of AC excitation, inductance comes into picture for steady-state performance. The flux is determined by the impressed voltage and frequency. The adjustment of magnetization current takes place as per the value of this flux to maintain the relationship imposed by the magnetization ....
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What is the difference between MCB and MCCB?
MCB (Miniature Circuit Breaker)-rated current not more than 100 A. Trip characteristics normally not adjustable. Thermal or thermal-magnetic operation. Breakers illustrated above are in this category.MCCB (Molded Case Circuit Breaker)-rated current up to 2500 A. Thermal or thermal-magnetic operation. Trip current may be adjustable in larger ratings. MCB (Miniature Circuit Breaker)-rated current not more than 100 A. Trip characteristics normally not adjustable. Thermal or thermal-magnetic operation. Breakers illustrated above are in this category.MCCB (Molded Case Circuit Breaker)-rated current up to 2500 A. Thermal or thermal-magnetic operation. Trip current may be adjustable in larger ratings.from Manu anand
Application of electrical circuit analogies in magnetic circuit?
Magnetic circuit follows equation (4) that is Ni = (Ф) ( l / μA) or m.m.f(magneto motive force) = (Flux) (reluctance).Electric circuit follows ohm's law that is E = I.R or e.m.f(electro motive force) = (current) (Resistance)From above point m.m.f in magnetic circuit is like as e.m.f in electrical circuit.Flux in magnetic circuit is similar as current in electrical circuit.Reluctance in magnetic circuit, S = ( l / μA) is similar to resistance R = (ρl/A) in electric circuit.Permeance (= 1/reluctance) in magnetic circuit is equivalent to conductance (=1/resistance) in electric circuit.In magnetic circuit flux establishes but not flow like as current in magnetic circuit.In magnetic circuit energy needed only to establish the flux but no consistent energy need to maintain it whereas in electric circuit continuous energy needed to flow of current.Resistance of an electric circuit is constant (for same temperature) and is independent of current but reluctance of magnetic circuit is not constant because it depends on μ (=B/H) which is not constant and depends on B/H.
How do you generate sinusoidal voltage?
The most common ways are:Mechanically, by placing a coil in a rotating magnetic field, or a rotating coil in a fixed magnetic field. This is how AC power is generated.Electronically, using an oscillator circuit. This is how sinusoidal waveforms are produced in all sorts of electronic equipment.
Resistive forces in an ac circuit is?
Impedance
Is ohm's law applicable to ac or dc and why?
Ohm's Law, in the sense of the ratio of voltage to current giving the value of the circuit's opposition to current flow, applies to both d.c. and to a.c. (interestingly, it also applies to magnetic circuits!).For d.c., the opposition is resistance, so V/I = R. But for a.c., the opposition is impedance, so V/I = Z.For a magnetic circuit, the opposition to the formation of magnetic flux is reluctance, so (magnetomotive force/flux) = reluctance.
Is a circuit a path made for magnetic field?
A circuit is a path for charge particles -- it conducts current. An inductor, a circuit component, generates a magnetic field, when an AC is on. ======================
Why do you get a typical sound when the transformer is put into operation?
vibration of the transformer's laminated core in response to the AC magnetic field.
Can you bypass the ac pressure switch?
Yes, for charging and diagnostic testing. Never for normal operation, it is a safety circuit.
Do transformers use steady magnetic fields to produce an emf in the secondary?
In an AC circuit it is the fluctuation of the sine wave which causes a varying magnetic field which in turn induces a current to flow in the secondary.
What is difference between magnetic circuit and electric circuit?
magnetic circit has a magnet and electri circuit has electricity
What is the difference between MCB and MCCB?
MCB (Miniature Circuit Breaker)-rated current not more than 100 A. Trip characteristics normally not adjustable. Thermal or thermal-magnetic operation. Breakers illustrated above are in this category.MCCB (Molded Case Circuit Breaker)-rated current up to 2500 A. Thermal or thermal-magnetic operation. Trip current may be adjustable in larger ratings. MCB (Miniature Circuit Breaker)-rated current not more than 100 A. Trip characteristics normally not adjustable. Thermal or thermal-magnetic operation. Breakers illustrated above are in this category.MCCB (Molded Case Circuit Breaker)-rated current up to 2500 A. Thermal or thermal-magnetic operation. Trip current may be adjustable in larger ratings.from Manu anand
Application of electrical circuit analogies in magnetic circuit?
Magnetic circuit follows equation (4) that is Ni = (Ф) ( l / μA) or m.m.f(magneto motive force) = (Flux) (reluctance).Electric circuit follows ohm's law that is E = I.R or e.m.f(electro motive force) = (current) (Resistance)From above point m.m.f in magnetic circuit is like as e.m.f in electrical circuit.Flux in magnetic circuit is similar as current in electrical circuit.Reluctance in magnetic circuit, S = ( l / μA) is similar to resistance R = (ρl/A) in electric circuit.Permeance (= 1/reluctance) in magnetic circuit is equivalent to conductance (=1/resistance) in electric circuit.In magnetic circuit flux establishes but not flow like as current in magnetic circuit.In magnetic circuit energy needed only to establish the flux but no consistent energy need to maintain it whereas in electric circuit continuous energy needed to flow of current.Resistance of an electric circuit is constant (for same temperature) and is independent of current but reluctance of magnetic circuit is not constant because it depends on μ (=B/H) which is not constant and depends on B/H.
Why should current be reversed in an AC circuit?
The current in any AC circuit reverses every cycle.
What kind of supply is given to the circuit?
ac supply is given and then in the circuit rectifier converts ac to dc
Is electromagnetism is possible with AC?
AC current creates an alternating magnetic field, consistent with the alternating voltage. The only way I know of using AC current to create a constant magnetic field is to rectify the AC into DC and then use that DC to create the magnetic field.
Is the magnetic field that is near an electrical circuit parallel or perpendicular to the circuit?
Perpendicular to the circuit.
WHAT STOPS a transformer windings FROM BEING A short circuit?
The transformer winding is a short circuit to DC. But for AC, the impedance of thecoiled winding and the magnetic coupling to another winding have the same effecton AC as resistance has in a DC circuit. That's why transformers don't work withDC, and are always operated with AC.AnswerIf you are querying why there are no short circuits between individual turns, it is because the windings are insulated not bare.
