Transformer With Varying dc Current

will the tranformers work on pulsating dc ? as there occurs a change in magnitude of the flux produced
- parvathy nair m (age 22)
kollam,kerala,india

You can take that "pulsating ac" and re-express it as the sum of a pure dc (just the average current) and an ac (the difference from the average). A transformer in its intended operating range is close to being a linear device, so its output is just what it would give for the ac part alone. If the dc part is too big, then the transformer core will saturate and the output will be reduced and distorted.

Mike W.

(published on 12/02/2013)

What do u mean by a "varying DC current" ? how can a DC source produce a varying current?
- Shiva Charan (age 22)
India

Good point. The variations are not, strictly speaking, DC themselves. As mentioned, you can express the pattern as the sum of a constant ("DC") average and a time-varying part with zero average ("AC"). 

In practice if you take a "DC" voltage source and turn the output knob back and forth you get a signal that's the sum of some dc and low-frequency ac. For many purposes it's ok to call that "time-varying DC".

Mike W.

(published on 03/08/2014)