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

October 15, 2021 | education

| **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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