A transformer cannot raise or lower the voltage of a D.C. supply because
A)there is no need to change the D.C. voltage
B)a D.C. circuit has more losses
C)Faraday's laws of electromagnetic induction are not valid since the rate of change of flux is zero
D)none of the above

Question

Quizplus · Accepted Answer

Transformers work on the principle of electromagnetic induction, which requires a changing magnetic field to induce a voltage in the secondary coil. In a DC supply, the current is constant, meaning there is no change in the magnetic field, and thus, the rate of change of flux is zero. This is why transformers cannot raise or lower the voltage of a DC supply.

A Transformer Cannot Raise or Lower the Voltage of a D.C