Question

do transfomer obeys ohm's law ?

Answer 1

A transformer obey's the conservation of energy law and Faraday's induction law.

Answer 2

Everything obey's Ohm's law--no exceptions. It's through Ohm's law that we define resistance across a consistent current.

Answer 3

A transformer is nothing more than a pair of inductors, which are perfectly ohmic (ie. they obey Ohm’s law).

http://www.blueraja.com/blog/194/do-transformers-obey-ohms-law

Answer 4

Not exactly. Ohm's Law, strictly interpreted, applies only to DC circuits, and a transformer in a DC circuit does nothing. (On the input side, it's just wire, and nothing at all happens on the output side.) This is not to say you cannot construct analogs to Ohm's Law for AC circuits.