Question

A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary in order to get output power at 230 V?

Answer 1

For a transformer

$U_s/U_p=N_s/N_p\to N_s=U_sN_p/U_p=230\cdot4000/2300=400$ turns. Answer