241. Трансформатор, содержащий №1 = 480 витков в первичной обмотке, понижает напряжение от U1 = 880 В до U = 220 В. Определить коэффициент трансформации и число витков вторичной обмотки на холостом ходу трансформатора.
To determine the transformation ratio of a transformer, we use the formula N1/N2 = U1/U2, where N1 and N2 are the number of turns in the primary and secondary coils respectively, and U1 and U2 are the primary and secondary voltages. In this case, we have U1/U2 = 880/220, which simplifies to 4. This means that for every 4 turns in the primary coil, there is 1 turn in the secondary coil. Therefore, the transformation ratio of this transformer is 1:4. To find the number of turns in the secondary coil at no load (or idle), we use the formula U1/U = N1/N2, where U1 is the primary voltage and U is the secondary voltage. In this case, we have 880/0 = 480/N2, which simplifies to N2 = (480*880)/220 = 1920 turns. Therefore, at idle, there are 1920 turns in the secondary coil of this transformer.
