Answer on Electromagnetism Question for hamid
As to whether a transformer obeys Ohm's Law, the answer is not straightforward. When the transformer is not supplying a load, the primary current is determined by the voltage and impedance of the primary windings and, say, doubling the voltage will double the primary current -so you could say that it is obeying Ohm's Law.
However, when the transformer is supplying load, the primary current is determined by the secondary current and not just by variations in the supply voltage, so is clearly not obeying Ohm's Law. Therefore transformers are non-ohmic devices.
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