How does a transformer react to a changing frequency Obviously the inductive reactance of the primary changes, which causes a decrease in the current for an increase in reactance, then so too shouldn't the output voltage be less? This seems to contradict Vs/Vp = Ns/Np What I am saying is, intuitively, I'm thinking a frequency increase should increase the output voltage. But arithmetically, I wouldn't get that increase I was thinking that the output voltage DOES change, but at a multiple of the input voltage for a change in frequency so the ratio remains constant. But this doesn't make sense since neither Vp, Np, or Ns is changing, therefore Vs cannot change either for a change in frequency. I know there are more losses, I have a document which explains why they use different frequencies in different parts of the world although I can't really find anything pertaining to how frequency effects output!... This is probably going to be one of those duh moments.. V = 4.44*phi*f*t so here it appears that it is frequency dependent I now keep reading that the frequency increase will increase the output proportionally, because of this equation.. ahh, does an increase in freqequency change Vp magnitude by increasing it? thereby keeping the ratio constant because it will also increase Vs?