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Let's look at a transformer first. Transformers are essentially two coils that are wrapped (wound) around a common core. The primary is supplied with a changing voltage. This develops a changing magnetic field in the core. And this changing magnetic field in the core "sweeps" the secondary windings and generates a voltage in those secondary windings. The changes in the primary due to the changing voltage are inductively coupled into the secondary to generate voltage there. The general answer to why a transformer doesn't work on a DC supply is that a DC voltage doesn't "change" and cause changes in the magnetic field in the core, and, thereby, cause changes in the voltage in the secondary windings. When we "turn on" the DC (direct current), a field will be built in the core, it will sweep the secondary windings and deliver a "pulse" as the field is built. But then the secondary voltage will drop to zero after the pulse. This is because there is a static magnetic field around the secondary windings, and a static field will not sweep the windings and generate a voltage. There will be no secondary voltage. It is possible to generate pulses of voltage in a transformer by pulsing a DC voltage supplied to the primary. The ignition coil in an automobile works in this way. The 12-volt supply is pulsed to the coil to generate the high voltage to fire the spark plugs. It is possible to get a transformer to work on DC. But, in general, transformers need a dynamically changing voltage supplied to them to cause the changing magnetic field in the core. This changing magnetic field will sweep the secondary windings and generate a changing voltage there. AC (alternating current) works really well for this application, and we use this idea in the power grids around the world.

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โˆ™ 2009-05-07 18:11:51
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Q: Why doesn't a transformer work on a DC supply?
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Is transformer is DC or ac supply?

A transformer is an AC supply device. You can use a transformer to build a DC supply, but the basic device is AC. There are power adapters on the market that produce DC. Rest assured that they contain multiple components, not just a transformer, in order to do that.


Can you use transformer for DC?

no,we cant use transformer in dc, but we can change the dc with help of switch (pulsating DC ) and connected to transformer. it will work


Does a transformer convert DC current to AC?

A transformer is a device to convert high voltage AC to low voltage AC & vice-versa. It works on the principle of induction. Since induction occurs only in an AC supply, a transformer cannot work on DC.. So, it is not possible to convert DC supply to AC using transformer. You would need an inverter to convert DC to AC.


Can you use 230 volt DC in transformer?

No. You can only use AC in a transformer. DC will, at minimum, trip the breaker, and, at maximum, destroy the transformer or cause other damage.


What is the difference between welding transformer and welding rectifier?

welding transformer is a machine supplying of electric current for melting the electrode, where welding recifier is a component of welding machine which converts AC to DC Any transformer by princples works only on Alternating Current. It cannot be used Directly on a DC Supply. Welding can be done using AC or DC depending on the required application. Therefore if any welding Application requires a Direct Current for obtaining optimum weld properties, then along with a Welding Transformer , a Rectifier Circuit is used on the Welding Output Side to Obtain DC from the AC Transformer. Hence the term Welding Transformer & Welding Rectifier ( which is a combo of Welding Transformer & a Rectifier )

Related questions

Why does a transformer only work for AC supply and not DC supply?

A transformer only work for ac supply and not dc supply because the frequency for a dc supply is zero leading to zero flux.


Why a transformer does not work in DC supply?

Due to the DC current does not produce the induction in the primary of the transformer.


Do pulse transformer is work on dc supply?

hthhrhr


Why doesn't transformer work on a DC supply?

to have transformer action there should be an alternating magnetic flux.but dc supply cannot produce alternating flux.


How does auto transformer work with DC supply?

Transformers don't work with DC supplies - they only work on AC.


Why transformer can not be used in dc supply?

The transformer cannot be used in the DC supply because it keeps on alternating its current, whereas the DC supply current should be constant.


Is transformer is DC or ac supply?

A transformer is an AC supply device. You can use a transformer to build a DC supply, but the basic device is AC. There are power adapters on the market that produce DC. Rest assured that they contain multiple components, not just a transformer, in order to do that.


What would happen if you connect a transformer to a DC source?

You would short out the DC supply, as a transformer, or coil is a short to DC.


Can you use transformer for DC?

no,we cant use transformer in dc, but we can change the dc with help of switch (pulsating DC ) and connected to transformer. it will work


What happens if dc supply is connected to incomer of transformer?

If a DC supply is connected to the incomer of a transformer, you effectively have a short circuit, because the DC impedance of a transformer (actually, any inductor) is quite low. You will blow something.


What happens transformer connected to DC supply?

Overloaded DC supply, fuses fail, possible smoke.


Does a transformer convert DC current to AC?

A transformer is a device to convert high voltage AC to low voltage AC & vice-versa. It works on the principle of induction. Since induction occurs only in an AC supply, a transformer cannot work on DC.. So, it is not possible to convert DC supply to AC using transformer. You would need an inverter to convert DC to AC.

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