A transformer has a turns ratio of 20:1 and a secondary voltage of 120 V. What is the primary voltage?

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Multiple Choice

A transformer has a turns ratio of 20:1 and a secondary voltage of 120 V. What is the primary voltage?

Explanation:
Voltage on primary and secondary scales with the turns on each winding. In an ideal transformer, Vp/Vs = Np/Ns. With a turns ratio of 20:1, the primary has 20 times as many turns as the secondary, so the primary voltage is 120 V × 20 = 2400 V. So the primary voltage is 2400 V. The other numbers would require a different turns ratio or mixing up which side has more turns.

Voltage on primary and secondary scales with the turns on each winding. In an ideal transformer, Vp/Vs = Np/Ns. With a turns ratio of 20:1, the primary has 20 times as many turns as the secondary, so the primary voltage is 120 V × 20 = 2400 V. So the primary voltage is 2400 V. The other numbers would require a different turns ratio or mixing up which side has more turns.

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