In a step-up transformer, which winding has more turns?

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Multiple Choice

In a step-up transformer, which winding has more turns?

The essential idea is that a transformer's voltage is set by the turns ratio between the windings. The voltages follow Vp/Vs = Np/Ns. To step up voltage, the secondary must have more turns than the primary, so the secondary winding ends up with more turns. The core isn’t a winding and doesn’t contribute to voltage transformation—it’s the magnetic path. If the secondary has more turns, its output voltage increases while the current on the secondary decreases roughly in inverse proportion to keep power roughly the same in an ideal transformer.

The essential idea is that a transformer's voltage is set by the turns ratio between the windings. The voltages follow Vp/Vs = Np/Ns. To step up voltage, the secondary must have more turns than the primary, so the secondary winding ends up with more turns. The core isn’t a winding and doesn’t contribute to voltage transformation—it’s the magnetic path. If the secondary has more turns, its output voltage increases while the current on the secondary decreases roughly in inverse proportion to keep power roughly the same in an ideal transformer.

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