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What happens when a transformer is fed with dc voltage?
a transformer require AC to function as desired it transform the AC to different levels. DC on a transformer can only see the actual primary or secondary resistance if the source is not limited in current it will burn the transformer by excessive heating since it will see only wire resistance. Answer 2 the application of an AC voltage, V on one winding of the transformer produces alternating flux that links the entire core of the transformer. The changing flux induces an emf, E that opposes the main voltage. the current through the winding in this case is {(V-E)/R}; R= winding resistance in case of application of DC, since there is no changing flux, there is no induced emf and hence the current will be V/R since the resistance of the winding is very small, the current is very high and this can burn away the windings. hence DC is not used.
Why should the secondary of a power transformer not to be left on an open circuit?
In general there is no reason why it should not be, though there may be special situations. Perhaps there is confusion with CURRENT transformers which must not be left open circuit because of the high voltages which they will produce. it may trip the CB. although there is no faults but a high current called Inrush current is flow when the the power transfomer energized while its secondry circuit is open
Why the windings burn when transformer is operated in DC?
Transformers are not intended to be operated in DC. DC does not provide the continuously fluctuating current that a transformer requires in order to function. On DC, a transformer will act as a transient mode inductor, and settle out to a high current state, destroying itself.
Will a bell ringing transformer operate on direct current?
No. Transformers always operate only on alternating current. They will burn up on direct current. That is, if the fuse does not blow first.
How transformer get burn?
Current overload from whatever circuit draws current from the transformer? Proper fusing of its supply might protect a transformer from this cause. Or it could have developed a shorted turn fault because the insulation on a winding got old and perished? Or maybe the transformer got damaged if the appliance it is mounted in was dropped?
Why transformer action takes place in a DC circuit?
A: A transformer is a PASSIVE ac component applying dc to it the wires resistance would be the only limiter for current flow. Usually a common transformer will burn up fast or slowly depends on power applied
Can you burn out a 750mA transformer in a 20a circuit?
If you know what you're doing, you can probably accomplish that in a 1A circuit.
What happens when a transformer is fed with dc voltage?
a transformer require AC to function as desired it transform the AC to different levels. DC on a transformer can only see the actual primary or secondary resistance if the source is not limited in current it will burn the transformer by excessive heating since it will see only wire resistance. Answer 2 the application of an AC voltage, V on one winding of the transformer produces alternating flux that links the entire core of the transformer. The changing flux induces an emf, E that opposes the main voltage. the current through the winding in this case is {(V-E)/R}; R= winding resistance in case of application of DC, since there is no changing flux, there is no induced emf and hence the current will be V/R since the resistance of the winding is very small, the current is very high and this can burn away the windings. hence DC is not used.
Why should the secondary of a power transformer not to be left on an open circuit?
In general there is no reason why it should not be, though there may be special situations. Perhaps there is confusion with CURRENT transformers which must not be left open circuit because of the high voltages which they will produce. it may trip the CB. although there is no faults but a high current called Inrush current is flow when the the power transfomer energized while its secondry circuit is open
What will happen to the transformer if the rated voltage is applied to the winding during short circuit test?
the winding would burn....
What happens when an alternating potential difference is applied across a primary coil of a transformer?
burn or burst
Why the windings burn when transformer is operated in DC?
Transformers are not intended to be operated in DC. DC does not provide the continuously fluctuating current that a transformer requires in order to function. On DC, a transformer will act as a transient mode inductor, and settle out to a high current state, destroying itself.
Will a bell ringing transformer operate on direct current?
No. Transformers always operate only on alternating current. They will burn up on direct current. That is, if the fuse does not blow first.
What happens if you replace a bulb in a circuit for a piece of plastic?
The plastic might burn.
When a dead short occur what happens to circuit resistance?
The circuit resistance is likely to gradually drop and in such case it will cause the circuit to burn down.
Why you do insulation resistance test?
in order to avoid unwanted short circuit break downs.... short circuit can burn the transformer and motor winding.... Megger is the device used to check the insulation .
How transformer get burn?
Current overload from whatever circuit draws current from the transformer? Proper fusing of its supply might protect a transformer from this cause. Or it could have developed a shorted turn fault because the insulation on a winding got old and perished? Or maybe the transformer got damaged if the appliance it is mounted in was dropped?
