Why is it that a transformer is always feed with an a.c and not a d.c current?
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With d.c.cotinuos flow of current,there is no magnetic flux change.so no induced current in the secondary coil.
ac can be stepped up or down while dc cannot
We must first understand the working principle of a transformer – Faraday’s Law of Electromagnetic Induction.
A transformer needs an alternating current that will create a changing magnetic field. A changing magnetic field also induces a changing voltage in a coil.
Whereas in D.C, current will be constant there will be no alternating current to create magnetic field . Due to this there is no change in magnetic field voltage induces will be zero.
Also, a transformer has high inductance and low resistance. In dc supply there is no inductance only resistance will act in the circuit so high current will flow through the primary of the transformer. For this reason the coil and insulation will burn out. So DC can’t be used .
Alternating current (AC) can be easily stepped up to high voltages thereby minimizing power loss