U₁/U₂ = N₁/N₂

Transformer turns ratio

Fewer secondary turns mean lower voltage and ideally higher current.

MINTSI
01

Inputs

Ideal output voltage.

Applied input voltage.

Ratio U₁/U₂ or N₁/N₂.

02

Result

Select a target and calculate.

Calculation

ü = U₁/U₂ = N₁/N₂

Fewer secondary turns mean lower voltage and ideally higher current.

Understand the inputs
  • Secondary voltage U₂Ideal output voltage.
  • Primary voltage U₁Applied input voltage.
  • Turns ratio üRatio U₁/U₂ or N₁/N₂.
Example

230 V / 24 V gives ü ≈ 9.58.

Assumptions and limits

Ideal transformer without copper, core or leakage losses.

Sources