In case of power adapter ( step-down) transformers, :?

In case of power adapter ( step-down) transformers, is it correct to say that current drawn from secondary winding should not affect the current drawn by primary from mains supply ?... if not why ? In other words, power consumption of a device should totaly be determined by primary winding only and not by... show more In case of power adapter ( step-down) transformers, is it correct to say that current drawn from secondary winding should not affect the current drawn by primary from mains supply ?... if not why ?
In other words, power consumption of a device should totaly be determined by primary winding only and not by secondary winding and circuit connected to it. Is this correct ?
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