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its a force that moves by electric current
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Does magnetising metal accelerate rusting?
Yes
What are precommissioning tests of transformers?
magnetising current test, magnetising balance test, s.c test, vector group test, winding resistance test, ratio test
What are the factors that increase the magnetising force of an electromagnet?
-- diameter of the current-carrying winding around it -- number of turns of wire in the winding -- magnitude of the current in the winding -- material comprising the core of the magnet
What is full load magnetising current of transformer?
is it primary current ?
The effects of reluctance and hysteresis with respects towards the magnetic circuits?
You can compare a magnetic circuit to an electric circuit, wheremagnetomotive force is equivalent to electromotive forceflux is equivalent to currentreluctance is equivalent to resistanceFor a magnetic circuit, the equivalent of Ohm's Law is: flux = mmf/reluctance.So, for a given value of magnetomotive force, the greater the reluctance, the lower the resulting flux. For example, iron will have a very low value of reluctance whereas air will have a very very high reluctance, so if a magnetic circuit has an airgap, then the overall reluctance of the circuit will be far greater than for a magnetic circuit without an airgap.Hysteresis comes from a Greek word, meaning to 'lag behind'. It describes how a magnetic circuit's flux density behaves when it is continuously magnetised and demagnetised. For example, when we apply a magnetising force, the flux density increases but, if we then remove the magnetising force, some flux density remains and, in order to remove this, we need to apply a magnetising force in the opposite direction. The amount of flux density remaining after we remove the magnetising force is called 'retentivity' and, for materials such as steel, this is quite large; but for other materials, such as iron, this is very small. So, hysteresis is a way of describing whether a metal is going to be suitable for use as a permanent magnet or for use as a temporary magnet. In particular, we need to understand the significance of hysteresis when choosing a suitable metal to manufacture transformer cores or motor magnetic circuits.
What three ways can you magnetize soft iron?
what are three methods of magnetising a piece of soft iron
Why flux must lag the applied voltage by 90degrees in transformers?
It's not a matter of 'must'; it's a natural phenomenon. Because of the very high inductance, the magnetising current lags the supply voltage by 90 degrees and the magnetic flux is in phase with the magnetising current.
What is magnetising force?
it is the force experienced by a north pole of strength 'p' placed at a distance 'd' meters from another pole of strength 'm'in a medium of relative permeability.in a steel nail there are these things called domains, in a weakly magnetized nail some of them will be pointing north, south, east and west, but however in a strongly magnetized nail all the domains will point to north.
What would happen is you rubbed a needle back and forth on a magnet?
the needle will have a magnetising pull by steeling the magnetic energy from the magnet
What is the use of novoltreleasecoil in starters?
no volt release coil is use for basicali magnetising & when over current is flowing it will demagnetising propus
What are compensating winding?
compensating windings are used to overcome armature reaction
What is magnetomotive force per unit length?
Magnetomotive force per unit length is the definition of magnetic field strength (symbol: H), formerly known as 'magnetising force'.Magnetomotive force is the product the the current flowing through a coil and the number of turns that make up that coil, and its SI unit of measurement is the ampere (although this is often spoken as 'ampere turn').So, the SI unit of measurement of magnetic field strength is the ampere per metre, although, again, it is often spoken as 'ampere turn per metre'.
