Transformer Turns Ratio Calculator — Formule
## Transformer Turns Ratio
The turns ratio determines the voltage transformation between primary and secondary windings.
### Formulas
**Turns Ratio = Vp / Vs = Np / Ns**
**Ip = VA / Vp** and **Is = VA / Vs**
Current transforms inversely: higher voltage means lower current, preserving power (minus losses).
**Power Loss = VA x (1 - Efficiency)**
Typical transformer efficiencies range from 90% (small) to 99% (large utility).
The turns ratio determines the voltage transformation between primary and secondary windings.
### Formulas
**Turns Ratio = Vp / Vs = Np / Ns**
**Ip = VA / Vp** and **Is = VA / Vs**
Current transforms inversely: higher voltage means lower current, preserving power (minus losses).
**Power Loss = VA x (1 - Efficiency)**
Typical transformer efficiencies range from 90% (small) to 99% (large utility).
Exemple Résolu
480 V to 120 V step-down, 5 kVA, 95% efficient.
- Turns ratio: 480 / 120 = 4.00:1
- Primary current: 5000 / 480 = 10.42 A
- Secondary current: 5000 / 120 = 41.67 A
- Power loss: 5000 x 0.05 = 250 W
- Output power: 5000 x 0.95 = 4,750 W