No, transformers cannot work on DC (Direct Current). Here's why:
A transformer works based on electromagnetic induction, which requires a changing magnetic field to induce voltage in the secondary coil. This changing magnetic field is produced by an alternating current (AC) in the primary coil, because AC keeps reversing direction, creating a fluctuating magnetic field.
On the other hand, DC is constant and does not change direction, so it creates a steady magnetic field. When you apply DC to a transformer, initially, it will produce a brief pulse of current (as the DC current begins to flow and create a magnetic field), but once the current stabilizes, the magnetic field will become constant. At this point, no further induction will occur, and the transformer will stop functioning.
In summary: **Transformers only work with AC, not DC**, because they rely on the changing magnetic field created by alternating current to induce voltage in the secondary coil.