If a transformer has a turns ratio of 27.5:1 and a primary voltage of 13,200 V, what is the approximate secondary voltage?

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Multiple Choice

If a transformer has a turns ratio of 27.5:1 and a primary voltage of 13,200 V, what is the approximate secondary voltage?

Explanation:
In an ideal transformer, voltages scale with the turns ratio: Vp/Vs = Np/Ns. A turns ratio of 27.5:1 means the primary has 27.5 times as many turns as the secondary, so the secondary voltage is Vp divided by 27.5. Calculate: 13,200 V ÷ 27.5 ≈ 480 V (since 27.5 × 480 = 13,200). So the secondary voltage is approximately 480 V. This fits the idea of a step-down transformer, where the secondary is much lower than the primary.

In an ideal transformer, voltages scale with the turns ratio: Vp/Vs = Np/Ns. A turns ratio of 27.5:1 means the primary has 27.5 times as many turns as the secondary, so the secondary voltage is Vp divided by 27.5.

Calculate: 13,200 V ÷ 27.5 ≈ 480 V (since 27.5 × 480 = 13,200).

So the secondary voltage is approximately 480 V. This fits the idea of a step-down transformer, where the secondary is much lower than the primary.

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