What is the voltage output of a transformer supplied with 480 V, 50 Hz, and a turns ratio of 4:1?

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Multiple Choice

What is the voltage output of a transformer supplied with 480 V, 50 Hz, and a turns ratio of 4:1?

Explanation:
Voltage transformation follows the turns ratio: Vp / Vs = Np / Ns. With a 4:1 ratio, the primary has four times as many turns as the secondary, so the secondary voltage is one quarter of the primary. Vs = 480 V × (1/4) = 120 V. The 50 Hz frequency doesn’t change this ratio in an ideal transformer; it mainly affects core flux and losses. So the output is 120 VAC.

Voltage transformation follows the turns ratio: Vp / Vs = Np / Ns. With a 4:1 ratio, the primary has four times as many turns as the secondary, so the secondary voltage is one quarter of the primary. Vs = 480 V × (1/4) = 120 V. The 50 Hz frequency doesn’t change this ratio in an ideal transformer; it mainly affects core flux and losses. So the output is 120 VAC.

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