# The voltages at the ends of the primary and secondary windings of an unloaded transformer are

The voltages at the ends of the primary and secondary windings of an unloaded transformer are U1 = 220 V and U2 = 20V. What is the ratio of the number of turns in the primary to the number of turns in the secondary?

These tasks: U1 (voltage value at the ends of the primary winding of the considered unloaded transformer) = 220 V; U2 (secondary voltage) = 20 V.

The ratio of the number of turns in the windings of the unloaded transformer under consideration) is the transformation ratio, which can be determined by the formula: k = N1 / N2 ≈ U1 / U2.

Let’s calculate: k = 220/20 = 11.

Answer: The ratio of the number of turns in the windings of the unloaded transformer under consideration is 11.

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