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Discussion this was my discussion below. the bold question is a responce please post a responce to the question instructor asked

One of the interesting properties of transformer is changing of voltage and current levels in ratio of turn ratio between primary and secondary windings of transformer. Since the primary current is related to secondary current by:Ip=Is/aHere “a” is turn ration of transformer. It can be seen from the formula, primary winding current is directly proportional to secondary winding current. It means transformer secondary winding impedance is reflected back to primary along with multiplication of turn ration factor. So, if the current through secondary increases, it will be reflected back in primary, resulting in consequent increase in primary winding current.This phenomenon can also be described on basis of induced emf and flux linkage. When secondary of transformer is short circuited, even small value of induced emf across secondary, induces huge amount of current through secondary circuit. This large value of current opposes the incoming flux through core of transformer, resulting in weak flux linkage between primary and secondary. As a result, nearly of the flux in contained within primary resulting in huge amount of current through it.In the same way, voltage across primary is directly related to secondary, as can be seen from the relation:Vp=aVsSo, if the primary is Open circuited, no voltage would induce in secondary, resulting in zero output voltage.It is common practice of connecting neutral wire of electrical outlet directly to ground. Hence, grounded objects near the device under test may be at dangerous potential level when comparing with test device. By using isolation transformer, this type of correspondence is eliminated, which in case of short circuit would result shock hazard to be avoided.

Noise is common transformer - what are the primay causes?

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