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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