windings

Hi everyone, I'm working with a step-down transformer and have encountered a few surprising characteristics in its construction that I would like to understand better. I would really appreciate any insights into why it might be designed this way. Transformer Specifications: Primary Voltage...

I saw a youtube video where we can increase the rpm of mini dc motors that operate on 9v but changing the windings with coil having more thickness . I did the same as shown in the video but whenever I connected the power supply the motor no longer spins.. it vibrates for like maybe half a second...