July 28, 2012

Can a transformer be used to transform direct voltage and direct current? Justify your answer.

The transformer cannot be used for dc supply system (dc voltage & current). According to working principle of the transformer, it works on Faraday laws of Electromagnetic Induction. Therefore, induced emf e = (-dφ/dt). The changing rate of magnetic flux is responsible for e.m.f generation, which opposes the change of magnetic flux that is indicated by negative sign. But in case of dc supply system (d.c Voltage & Current), there is no change of magnetic flux, d φ = 0, so that induced emf at secondary side of transformer is zero. Therefore, we cannot use transformer for dc supply system.


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