Calculateur de Rapport de Transformation Gratuit
Calculez le rapport de transformation d'un transformateur.
V
V
A
Turns Ratio (Np/Ns)
10.00 :1
Secondary Current5.00 A
Apparent Power60.0 VA
Turns Ratio (Np/Ns) vs Primary Voltage
Formule
## Transformer Turns Ratio ### Formulas **Np/Ns = Vp / Vs** **Is = Ip x Np/Ns** (ideal transformer) **Power = Vp x Ip = Vs x Is** An ideal transformer conserves power. Real transformers have 90-98% efficiency due to copper and core losses.
Exemple Résolu
120 V primary to 12 V secondary, 0.5 A primary current.
- 01Turns ratio = 120 / 12 = 10:1
- 02Secondary current = 0.5 x 10 = 5 A
- 03Power = 120 x 0.5 = 60 VA
Questions Fréquentes
What is VA rating?
Volt-amperes: the apparent power rating of a transformer. For resistive loads, VA equals watts.
Step-up vs step-down?
Step-down has ratio > 1 (higher primary). Step-up has ratio < 1 (higher secondary). Same transformer works both ways.
Why does current increase when voltage decreases?
Power is conserved. Lower voltage means higher current to deliver the same power.
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