No. A constant DC current of sufficient magnitude
induces smoke in a transformer.
When the secondary of a transformer is opened, there is no longer any load on the transformer. There will be some current flowing in the primary winding, which is needed to induce the voltage in the secondary. This primary current is referred to as the "no load" current, and is indicative of the core losses in the transformer.
The ability of conductor to induce voltage in itself when the current changes is called inductive reactance.
There would be no rectified output. The transformer primary has to be closed to induce a current into the secondary winding. At this point of the secondary the voltage is still AC. This voltage is then applied to the rectification bridge to change it to DC. So you can see how no voltage on the primary, the same as the unit being unplugged, affects the output voltage.
In DC, flow of current is controlled by resistance only where as in AC it is done by Impedance which is combination of Resistance , inductive and capacitive reactances.Reasons:In transformers resistance of the transformer's core windings are very low due to which if you will connect transformer across DC supply then it will draw a heavy current which will burn out is winding and it may damage the equipment too.Transformers works of the principal of Induction (Mutual/Self) that is possible in AC only because in DC there is no induction therefore even if transformer's windings anyhow withstand with DC there will be no voltage output at output terminals of the transformer, therefore it is useless to connect transformer on DC supply.
due to change in flux
No, the current has to change for a voltage to be induced in the transformer.
According to Faraday's Law only if there is change in flux linkage of a conductor then current is induced between mutual inductors. Now DC will induce a constant a constant flux in the transformer core, consequently in the secondary coil. So constant flux cannot induce a current in the secondary. SUBHRA JYOTI SAHA
In order to induce voltage as an output, a changing magnetic field is needed. To create a changing magnetic field in the transformer a changing current and that is an alternating current.
When the secondary of a transformer is opened, there is no longer any load on the transformer. There will be some current flowing in the primary winding, which is needed to induce the voltage in the secondary. This primary current is referred to as the "no load" current, and is indicative of the core losses in the transformer.
A step-up transformer increases the voltage of an electrical current by having more turns in the secondary coil than in the primary coil. This causes the magnetic field to induce a higher voltage in the secondary coil, resulting in an increase in voltage.
A: Believe it or not that what a transformer does
The ability of conductor to induce voltage in itself when the current changes is called inductive reactance.
DC cannot be easily stepped down using a transformer like AC because transformers work on the principle of electromagnetic induction, which requires a changing magnetic field to induce a current in the secondary coil. Since DC has a constant magnetic field, it cannot induce a current in the secondary coil of a transformer. However, DC can be stepped down using other methods such as voltage divider circuits or chopper circuits.
Think of a transformer as a foot pump. Putting pressure on it will cause it to pump air but you need to release the pressure to do it again. The transformer does the same for electricity, if DC is applied to it it will create one pulse of current from the output but that is all. You need the continues rise and fall of AC to work the pump.
A transformer is the device used to increase or decrease the voltage of alternating current (AC) This is done through a process referred to as inducing.It's operation is based on the fact that electricity produces a magnetic field around itself. By placing 2 coils of cable beside each other, the magnetic field of one coil will induce a voltage in the other coil.
The iron core of a transformer holds a magnetic field when energized by the primary windings that conduct current. It is the building up and collapse of the magnetic field that induces current in the secondary windings. Direct current has no build up or decay of magnetic field (except when turned on and shut off) so no current is induced in the secondary windings.
Transformers only work on a.c. This is because it's necessary to have a changing primary current in order to induce a voltage into the secondary winding.If you connect a battery across a transformer, it will not work. Furthermore, if the voltage of the battery matches that of the rated primary voltage, the resulting very large d.c. current is likely to overheat the primary windings and even burn it out.