This question is primarily regarding transformers, particularly the impact frequency has on hysteresis loss. Given hysteresis loss = η×Bmax×f×V and Bmax = (V ×〖10〗^ 8)/(√2 π×f×N×A) This means that hysteresis loss = η (V ×〖10〗^8)/(√2 π×f×N×A) fV = (η ×〖10〗^8)/(√2 π×N×A) V^2 And as such frequency has no impact on hysteresis loss. This seems to me to be completely incorrect, as my understanding of hysteresis is that it's the energy input to change the direction of electron motion, and thus greater frequency means greater energy input. Is this incorrect, or is there a fault in the equations? In addition, I found that if the core in a transformer is parallel to the lines of flux, then power loss to eddy currents is negligible. Is also correct? Why/why not?