Can a transformer work with DC?
A transformer is a device which step-up or step-down the level of AC current or voltage without changing the primary (i.e. input source) frequency. Transformer only works on AC and can’t be operated on DC i.e. it has been designed to be operated only and only on alternating current and voltage.
Why do transformers work with AC and not DC?
Transformer only works in AC supply because for induction process, it is necessary to present change of flux. And in DC supply there will be no flux change phenomenon happen so induction process couldn’t be happen. That’s why transformer is used in AC supply.
Why do Transformers not work with a DC supply?
The basic reason is that you need a changing magnetic field in order to induce a voltage in a loop of wire. So transformers work with AC since the magnetic field is oscillating at 60 Hertz. If you plug the transformer into a DC circuit, the magnetic field is a constant, after a short initial spike. No oscillating magnetic field, no output voltage.
Is the DC current in a transformer constant?
So, there can be two categories of DC Source, a voltage source and a current source. First let us consider the possibility when a DC current source is connected to a Transformer. In that case the current through the transformer winding will be constant and hence the mmf and flux produced will also be constant.
Why are transformers rated in kVA and not in kW?
The reason why the transformer does not work on dc supply is explained below. Why Transformers are rated in KVA and not in KW? The transformer works on the principle of mutual induction, for which current in one coil must change uniformly. If dc supply is given, the current will not change due to constant supply and the transformer will not work.
Where does the current go in a transformer?
For an instant, a very small instant, you’ll get a voltage across the secondary coil, and after that, you’ll short your D.C. supply. A transformer has two coils, a primary coil, where the input voltage and current are fed, and an output coil, which turns out the processed voltage and the current, connected to the load.