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Transformer Voltage Ratio

Also known as turns ratio

VsVp=NsNp\frac{V_{s}}{V_{p}} = \frac{N_{s}}{N_{p}}

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An ideal transformer trades voltage for current through its turns ratio: each secondary turn intercepts the same changing magnetic flux, so ten times the turns means ten times the induced voltage. A step-up transformer (Nₛ > Nₚ) raises voltage for efficient long-distance transmission; a step-down one feeds your phone charger. It only works on AC — a steady DC flux induces nothing.

Transformer Voltage Ratio
VsVp=NsNp\frac{V_{s}}{V_{p}} = \frac{N_{s}}{N_{p}}
Where
  • VpV_{p}= Primary voltage
  • VsV_{s}= Secondary voltage
  • NpN_{p}= Primary turns
  • NsN_{s}= Secondary turns
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