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Why would a transformer designed to be connected to an emf of amplitude 170V be damaged if connected to a dc emf?
Wiki User
∙ 13y ago
Transformers can't be connected In DC because they are not designed to be.
When connected to an AC supply, current will flow through the primary winding. This current produces an alternating magnetic flux in the core. This flux links the primary winding to the secondary winding, inducing a voltage in the secondary winding. The induced current in the secondary winding, then causes a back emf to the primary winding, which limits the current drawin in the primary winding. At no load (when the secondary of the transformer is open circuited), this is called the magnetizing current.
If the primary winding was connected to the DC supply, flux would be produced in the core just like the AC example, but this flux would saturate the core and no back emf would be generated by the secondary winding. This results in the only resistance seen by the DC supply being the transformer DC resistance, which is very low. Thus excessive current will flow in the primary, which will eventually damage the winding.
Wiki User
∙ 13y ago
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