Turns Ratio

TR = Ns / Np

where TR = turns ratio;

Ns = # of turns in secondary winding;

Np = # of turns in primary winding

Voltage / Current Ratios

Ns / Np = Vs / Vp = Ip / Is

Vs = TR x Vp

Is = Ip / TR

where Vs = voltage in secondary winding;

Vp = voltage in primary winding;

Is =current in secondary winding;

Ip = current in primary winding;

Ns = # of turns in secondary winding;

Np = # of turns in primary winding

Impedance Ratio

TR = sqrt (Zs / Zp)

where TR = turns ratio;

Zp = impedance reflected into the primary side with a secondary load of Zs