Question

Va rog frumos ,am nevoie de ajutor!​

Answer 1

$n=\frac{N_p}{N_s}= \frac{I_s}{I_p}= \frac{U_p}{U_s}=\frac{42}{220}= 0,19=>n=0,19\\ \frac{I_s}{I_p}= \frac{U_p}{U_s}=>I_s=\frac{I_pU_p}{U_s}=\frac{30*42}{220}=5,72 A=>I_s=5,72 A$