How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?

How many primary volts must be applied to a transformer with a turns r

1.	How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?
Answer» We know that, V2/V1 = N2/N1. Given V2 = 9v, N2/N1 = 0.1 Therefore, 9v/V1 = 0.1 V1 = 9v/0.1 = 90v. For more detail: Step Down Transformer - Circuit with Simulation.