Electricity circuit question?

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Electricity circuit question?



An ideal transformer connects a 120-V source to a 12-V, 1-A load. The secondary has 90 turns. 

A transformer steps down a 120-V source to 6.3V. What is the impedance ratio? 

in this case, do I have to change Vpri form 120-V to 6.3V? Can Vsec can be bigger than Vpri? 

Zpri/Zsec = (Vpri/Vsec)^2 

= (6.3V/12V)^2 

is it how I do it? 
am i correct?



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