I have an educational single phase step-down/step-up transformer which is fed by a 120V Variac (Variable Transformer) that allows you to add as many turns as you wish ON THE SECONDARY (Insulated wire is used). Currently I am using the transformer as a step-down transformer with TWO TURNS ON THE SECONDARY (Ns = 2). I measured values for Vs (Secondary Voltage), Np (Set amount of turns which cannot be changed), Ns = 2, Ip (Primary Current), & Is (Secondary Current) with a Primary Voltage (Vp) = 10% on variac = 11.5Vac (.10 x 115Vac)
How would I hand calculate these values for when Ns = 3 at 10% on the variac before physically adding an extra turn? I am very familiar with using the transformer ratios for calculations (Np/Ns = Is/Ip = Vp/Vs). However, my calculation is not adding up for the new Vp? Can Volts per turn be used to calculated new values?
How would I hand calculate these values for when Ns = 3 at 10% on the variac before physically adding an extra turn? I am very familiar with using the transformer ratios for calculations (Np/Ns = Is/Ip = Vp/Vs). However, my calculation is not adding up for the new Vp? Can Volts per turn be used to calculated new values?