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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?

9 V
90 V
900 V
0.9 V

Correct Answer: 90 V

Explanation:

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.

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