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Transformers only work on ac supply because it principle is mutual induction. DC supply has constant magnitude whereas AC has alternating magnitude. so we can step up or step down current/voltage in transformer in ac only.

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Q: Why do transformers work only work on an AC supply?
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How does auto transformer work with DC supply?

Transformers don't work with DC supplies - they only work on AC.


Transformer are used in circuits containing both dc and ac?

No transformers only work with AC.


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When ac motor is connected with DC supply?

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