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Can step down transformer used as step up transformer ? and why?

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aruleee

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Can step down transformer used as step up operation?
 

There is two important point:
1)Isolation of primary instead of secondary
2) amount of current that to coil's can support
 

Yes You can. Step down transformer is step up if you swap the primary with Secondry. But power & voltage level should be same for respective windings.
 

Yes, you can use the step down transformer as step up.
Example: Say you have a 220V (primary) to 12V (secondary) transformer rated for 1A output
When you apply 220V to the primary, you get around 12V at the output. You can get max 1A at the output.
Now you can use the same transformer as step up. If you have a 12VAC source, connect it to the 12V winding (the secondary, which is now to be used as primary). Then at the output, you'll get approximately 220V. Now, the transformer was rated for 12VA power (12V 1A output). So, make sure that the load at the output is less than 12VA.

Hope this helps.
Tahmid.
 

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