can we use single phase transformer as step down from 110vdc-to 48vdc if not why?

Answer 1

Transformers only work on ac. You can buy dc to dc converters. The theory of them is a circuit to create ac (oscillator), a transformer and a rectifier to convert back to dc.

Answer 2

Because transformers work only with AC current.

If you know the wattage of the device you want to use, it is possible to wire in a lightbulb *in series* with it to provide the voltage drop. You want a 110v lightbulb approximately 2.3 times the wattage of the device.
It's a little wasteful of electricity, but much cheaper than buying an inverter/transformer rig.

Do this only if you understand what you're doing, I don't want anyone electocuted on my advice!

Answer 3

there is not any difference in motor administration transformer and any unmarried section typical transformer, as long as you have the right kva to ability your magnetic contactor dealing with it is inrush present day, a 500 va transformer is already sufficiently massive to administration a magnetic contactor. at present day we are in straight forward terms setting up a three hundred va sq. D administration transformer on our made boilers. this 3 hundred va handles all gas valves, related burner controls and the magnetic contactor rated 5 hp under. via ways we are fusing our time-honored(2 fuses) and a secondary unmarried fuse, and the different line is related to floor for defense purposes.

Answer 4

Transformers depend on the cyclical (AC) buildup and decay of electric fields in coils of wire and magnetic fields in metal cores. A DC current can give you only one cycle (make or break). 110vdc will not transform to 48vdc.

Answer 5

you'd have to convert the 110vdc to a alternating current (or pulse) before it would work.