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A transformer has two coils coupled via the magnetic field, and when it has no load all you see is the inductance of the primary coil, which has to be fairly high to create the necessary amount of magnetic flux.
When the transformer supplies a resistive load, the input looks much more resistive.
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∙ 10y ago
Anonymous
Because it has a primary winding and the primary windings contains number of turn
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What are two types of EMF induced in a double wound transformer?
1. self- induction2. mutual- induction
What is the meaning of mutual inductance as transformer works on the principle of mutual inductance?
Mutual inductance describes the process by which a changing current in one coil, creates a changing magnetic flux which, when it links with a second coil, induces a changing voltage into that coil.
Why the power factor of a transformer is poor at no load?
The inductance of the transformer is much higher than the resistance of the transformer, resulting in very low real power losses (in watts), but some reactive power (vars).
What is the mean of in electrical uH?
The electrical abbreviation ( UH ) is a measure of inductance , as in a ferrite transformer core , inductors , choke etc. .
A auto transformer has what kind of induction?
self-induction."According to Lenz's law,[6]a changing electric current through a circuit that contains inductance, induces a proportional voltage, which opposes the change in current (self-inductance). The varying field in this circuit may also induce an e.m.f. in neighbouring circuits (mutual inductance)." - Wikipedia
What does LT stand for in power transformer?
Transformer Inductance?
What is an example of mutual inductance?
A transformer because, to work, it must use mutual inductance between its separate windings.
What principle emf induces in secondary winding of transformer?
mutual inductance
Why there is a phase shift of 30degree in Dyn11 3 phase transformer?
The phase shift is caused by inductance in the transformer. Any inductance from magnetic flux that fails to link both windings is called leakage flux, and the resulting inductance is called leakage inductance.
What are two types of EMF induced in a double wound transformer?
1. self- induction2. mutual- induction
What is the main cause for the coefficient of coupling of a transformer being less than unity?
initially the induced emf i.e.,self inductance is high than mutually induced emf in the other .....so coefficient of coupling is high
Why transformer core is of magnetic not of wooden?
The transformer core is ferromagnetic in order to focus and concentrate the magnetic fields generated in the windings. This improves coupling and increases inductance.
What is the meaning of mutual inductance as transformer works on the principle of mutual inductance?
Mutual inductance describes the process by which a changing current in one coil, creates a changing magnetic flux which, when it links with a second coil, induces a changing voltage into that coil.
Why the power factor of a transformer is poor at no load?
The inductance of the transformer is much higher than the resistance of the transformer, resulting in very low real power losses (in watts), but some reactive power (vars).
What is the mean of in electrical uH?
The electrical abbreviation ( UH ) is a measure of inductance , as in a ferrite transformer core , inductors , choke etc. .
What is mutual coupling in transformer?
It stands for how does the primary and secondary winding magnetic fields connected firmly without much of leakage flux.
Is the mutual inductance of a transformer is constant under all operating conditions?
The mutual inductance is defined as the voltage induced in one winding when the current in the other winding changes by one amp per second. In an AC system it is the open-circuit induced voltage in the secondary divided by 2 x pi x frequency times the current in the primary. The mutual inductance is determined by the size and shape of the transformer. However if the transformer is operated at more than the rated flux-density of the magnetic core material, the mutual inductance falls (for normal laminated iron cores the maximum flux density is 1 Weber per square metre).
